Question

In an A. P. If a = 21 , d = -3 and the nth term is equal to zero , then the value of n is : *

Answer 1

Answer:

8

Step-by-step explanation:

0 = a+( n- 1)d

0= 21+ (n-1)×(-3)

21+ { -3n +3}

24 = 3n

n= 8