1.

Which term of A. P. 21, 18 ,15......is zero ​

Answer»

ong>ANSWER:

a = 21

d = 13

an = 0

an = a + (N-1) d

0 = 21 + ( n - 1) -3

-21/-3 = n - 1

7+1 = n

n = 8



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