Question

Which term of A.P 21,42,63,84......is 210​

Answer 1

Step-by-step explanation:

Let nth term of the given AP be 210

Here, first term, a = 21

and common difference, d = 42 - 21 = 21 and an = 210

∵ an = a + (n-1)d

⇒ 210 = 21 + (n-1)21

⇒ 210 = 21 + 21n - 21

⇒ 210 = 21n ⇒ n = 10

Hence, the 10th term of an AP is 210.

Answer 2

Answer:

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