Mathmetics

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

Q1.
The 7th and 12th term of an arithmetic progression are -15 and 5 respectively. What is the 16th term ?

1) 18 2) 19
3) 21 4) 24
5)None of these
Answer : 21
Explanation :
 T7 = a + 6d = -15 ....... (1)
T12 = a + 11d = 5 ...... (2)
On solving (1) and (2), d = 4 & a = -39
T16 = a + 15d = -39 + 15(4) = -39 + 60 = 21
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