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Question

If the 7th and 13th terms of an AP are 34 and 64 respectively, then its 18th term would be ___ 


Your Answer
A
87
Your Answer
B
88
Correct Answer
C
89
Your Answer
D
90

Solution

The correct option is D 89
an=a+(n1)da+6d=34(1)a+12d=64(2)Solving (1) and (2),a=4 and d=5a18=4+(17)5=89

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