Question

which term of the Ap 21,42,62,84----is210?

Answer 1

Hello there ♥️​

a = 21

d = 42-21 = 21

an = 210

n = ?

an = a +(n-1)d

210 = 21+(n-1)21

n-1 = 189/21

n = 9+1 = 10

Hence, 210 is the 10th term of given A.P

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Answer 2

Given, a=21 and d=42-21=21
Tn =210
a+(n-1)d=210
or ,21+(n-1)21=210
or , 21+21n-21=210
or, 21n=210
n=10
Therefore 10 th term of given AP is 210

Hope it helps you....