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

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10th Explanation: Let nth term of the given AP be 210 According to question, First term, a = 21 Common difference, d = 42 – 21 = 21 and an = 210 We know that the nth term of an AP is an = a + (n – 1)d Where, a = first term an is nth term d is the common difference 210 = 21 + (n – 1)21 189 = (n – 1)21 n – 1 = 9 n = 10 So, 10th term of an AP is 210.

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