Question

which term of the AP is 21,42,63,84........each 210

Answer 1

210=21+(n-1)×21,

then

210/21 = [1+(n-1)],

10=1+(n-1),

10-1=n-1,

9=n-1,

9+1=n,

n=10

Answer 2

(^_-)
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an= a+(n-1) d

an=210

@=21

d =a2-a1

d=42-21=21

210=21+(n-1)21
210-21=21n-21.

189+21=21n

210=21n

n=210/21

n=10

✌✌✌⭐⭐⭐⭐⭐⭐:)