Question

Which term of the A.P: 21,42,63,84,... is 210?

Answer 1

Answer:

Let nth term be 210

Here, a=21 and d=21

Therefore,

tn=210

tn=a+(n-1) d..... (Formula)

210=21+(n-1) 21

210-21=21n-21

189=21n-21

189+21=21n

210=21n

n=210/21

n=10

Therefore,

10th term of an AP is 210.

Answer 2

Answer:

Step-by-step explanation:

Let nth term be 210

Here, a=21 and d=21

Therefore,

tn=210

tn=a+(n-1) d..... (Formula)

210=21+(n-1) 21

210-21=21n-21

189=21n-21

189+21=21n

210=21n

n=210/21

n=10

Therefore,

10th term of an AP is 210.

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