1.

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

Answer»

Answer:

8

Step-by-step EXPLANATION:

0 = a+( N- 1)d

0= 21+ (n-1)×(-3)

21+ { -3n +3}

24 = 3n

n= 8



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