Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q61. 

1)  90 and 24  2)  120 and 24 
3)  120 and 54  4)  180 and 114 
5)  None of these 
Answer : 90 and 24
Explanation : The factors of 360 = 2 X 2 X 2 X 3 X 3 X 5
Explanation : The factors of 360 = 2 X 2 X 2 X 3 X 3 X 5
So, two numbers are 2 X 2 X 2 X 3 =24 and 2 X 3 X 3 X 5 = 90
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Q62. 

1)  Neither I nor II  2)  Either I or II 
3)  Both I and II  4)  Only II 
5)  Only I 
Answer : Either I or II
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Q63.  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
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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Q64. 

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
Explanation : x .5, x1.5, x 2.5, x 3.5 , x 4.5 and so on
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Q65. 

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 ...
Explanation : x 2 1, x 32, x 43, x 5 4 and so on ...
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Q66. 

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 ....
Explanation : x 1+1^{2},, x 2+2^{2}, x 3+3^{2}, x 4+4^{2} and so on ....
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Q67. 

1)  34  2)  46 
3)  70  4)  76 
5)  None of these 
Answer : 46
Explanation : x 2 +6 , x 2+6 , and so on
Explanation : x 2 +6 , x 2+6 , and so on
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Q68. 

1)  146  2)  162 
3)  166  4)  184 
5)  None of these 
Answer : None of these
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Q69. 

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
Explanation : x 1 + 1^{2}, x 2 2^{2}, x 3+3^{2}, x 4 4^{2} and so on
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Q70. 

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
Explanation : +7 x 1/2 , +6 x 2 , + 5 x 1/2, + 4 x 2, so on
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