Question

How many terms of the AP. 18,16,14,........... be taken so that Thier sum is zero​

Answer 1

Explanation:

take sn=0

then sn=n/2( 2a+ (n-1)d

0 = n/2( 36+ (n-1)-2

0= n(36-2ñ+2)

36n-2n²+2=0

18-n²+1=0

do. this quadratic equation then u will get n

n means the. no of terms

u can solve it by using -b±✓b²-4ac/2a

Answer 2

here is the solution of ur ques

i hope it will help u☺☺