Question

9) An AP consisting 7 terms having first and last terms are 4 and 44 find their sum.

Answer 1

Step-by-step explanation:

t1 = a = 4

tn = 44

Sn = n/2 (t1 + tn)

S7 = 7/2 ( 4 + 44)

= 7/2 x 48

= 7 x 24

= 168