SOLUTION: Which term of the AP: 21, 42, 63, 84,... is 210? (A) 9th (B) 10th (C) 11th (D) 12th

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Question 1143173: Which term of the AP: 21, 42, 63, 84,... is 210?
(A) 9th (B) 10th (C) 11th (D) 12th

Answer by math_helper(2461) About Me  (Show Source):
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21, 42, 63, 84, ..., 210
Divide each element by 21, that should immediately give you the answer, as the divided AP will be 1, 2, 3, ... , N.