Question

If the fourth term of an AP is 13, then the sum of first seven terms is

a)137 b)7×13 c)713 d) none of these​

Answer 1

Answer:

hii...

answer is..

137...

..

THANKYOU

Answer 2

Answer:

91 or 7*13

Step-by-step explanation:

4th term = a+3d=13

Sum of first 7 terms= $\frac{7}{2} *(2a+6d)$

$=7(a+3d)$

But, we know a+3d=13

Hence, the sum= 7*13

=91

Hope it helps.