Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q11.  If x=2015, y=2014 and 2013 , then x^{2}+y^{2}+z^{2} xyyzzx = ? 
1)  2 
2)  3 
3)  4 
4)  6 
5)  None of these 
Answer : 3
Explanation : ATQ:
x^{2}+y^{2}+z^{2} xyyzzx= x^{2}xy+y^{2} yz+z^{2}zx = x(xy) + y((yz) + z(zx)= 2015(20152014) + 2014(20142013)+2013(20132015)
= 2015 + 2014 + 4026
=40294026 =3
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Q12.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 4 2 3 7.5 26.25 118.125 (B) 6 (a) (b) (c) (d) (e)
What will come in the place of (c) ?

1)  12.25 
2)  11.5 
3)  11.125 
4)  12.5 
5)  None of these 
Answer : None of these
Explanation : x .5, x1.5, x 2.5, x 3.5 , x 4.5 and so on
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Q13.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 2 3 7 25 121 721 (B) 3 (a) (b) (c) (d) (e)
What will come in the place of (c) ?

1)  31 
2)  39 
3)  45 
4)  49 
5)  None of these 
Answer : 49
Explanation : x 2 1, x 32, x 43, x 5 4 and so on ...
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Q14.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 2 3 10 39 172 885 (B) 5 (a) (b) (c) (d) (e)
What will come in the place of (d) ? 
1)  175 
2)  196 
3)  208 
4)  244 
5)  None of these 
Answer : 244
Explanation : x 1+1^{2},, x 2+2^{2}, x 3+3^{2}, x 4+4^{2} and so on ....
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Q15.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 3 12 30 66 138 282 (A) 7 (a) (b) (c) (d) (e)
What will come in the place of (b)?

1)  34 
2)  46 
3)  70 
4)  76 
5)  None of these 
Answer : 46
Explanation : x 2 +6 , x 2+6 , and so on
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Q16.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 7 20 46 98 202 410 (A) 4 (a) (b) (c) (d) (e)
What will come in the place of (d)?

1)  146 
2)  162 
3)  166 
4)  184 
5)  None of these 
Answer : None of these
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Q17.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 9 10 16 57 212 1085 (A) 2 (a) (b) (c) (d) (e)
What will come in the place of (c)?

1)  15 
2)  18 
3)  25 
4)  36 
5)  None of these 
Answer : 15
Explanation : x 1 + 1^{2}, x 2 2^{2}, x 3+3^{2}, x 4 4^{2} and so on
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Q18.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 3 5 22 13.5 35 19 (B) 5 (a) (b) (c) (d) (e)
What will come in the place of (c)?

1)  13 
2)  14.5 
3)  15.5 
4)  16 
5)  None of these 
Answer : 14.5
Explanation : +7 x 1/2 , +6 x 2 , + 5 x 1/2, + 4 x 2, so on
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Q19.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 3 40 176 537 1078 1079 (B) 1 (a) (b) (c) (d) (e)
What will come in the place of (e) ?

1)  839 
2)  738 
3)  829 
4)  938 
5)  None of these 
Answer : 839
Explanation : x 5 + 5^{2} , x 4 + 4^{2} , x 3 +3^{2}
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Q20.  Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).You have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.
(A) 4 2.25 3.25 7.125 18.25 51.875 (B) 7 (a) (b) (c) (d) (e)
What will come in the place of (b) ? 
1)  4.125 
2)  5.25 
3)  6.75 
4)  4.125 
5)  None of these 
Answer : 4.125
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