Which term of the AP: 21, 42, 63, 84, ldots i | vedclass

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(B) Let the $n^{th}$ term of the given $AP$ be $210$.Here,the first term $a = 21$.The common difference $d = 42 - 21 = 21$.We know the formula for the

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$10$

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(B) Let the $n^{th}$ term of the given $AP$ be $210$.Here,the first term $a = 21$.The common difference $d = 42 - 21 = 21$.We know the formula for the $n^{th}$ term of an $AP$ is $a_n = a + (n - 1)d$.Substituting the values,we get $210 = 21 + (n - 1)21$.$210 = 21 + 21n - 21$.$210 = 21n$.$n = 210 / 21 = 10$.Therefore,the $10^{th}$ term of the $AP$ is $210$.

Which term of the $AP: 21, 42, 63, 84, \ldots$ is $210$?

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