If the 4th term of an arithmetics progression is 14 and its 12 th term is 70 the

Question

If the 4th term of an arithmetics progression is 14 and its 12 th term is 70 then find its first term.

Options:

A . – 10

B . – 7

C . 10

D . 7

Answer: Option B

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sharmila karthick 2017-06-16 19:25:12

a1+(n-1)d=87
2+(n-1)5=87
2+5n-5=87
5n-3=87
5n=90
n=18

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