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Which of the following is a Triangular number series?(a) 1, 3, 6, 9, 12, 15…..(b) 1, 3, 6, 10, 15, 21……(c) 1, 6, 12, 18, 24…..(d) none of the mentionedThis question was posed to me in a national level competition.This interesting question is from Special Sequences in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics |
Answer» Correct answer is (B) 1, 3, 6, 10, 15, 21…… |
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