Question

In an A. P if a =21 d=-3 and an=0, then the value of n is (a)8(b) 7(c) 9(d) 6​

Answer 1

Answer:

Given:

d=−2

n=5

a

n

=0

We know:

a

n

=a+(n−1)d

∴0=a+(5−1)(−2)

∴a=8

Hence, the value of a is 8.

Answer 2

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