Question

(18) if first term of A.P. is 18 and last tert is 42, then
the sum of first 20 terms is
(A) 300
(C) 500 (0) 600
(B) 400​

Answer 1

Answer:

600

Step-by-step explanation:

s= n/2(a+l)

= 10×(18+42)

10×60

=60

जहां a =प्रथम पद l= अंतिम पद