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Adding Triangular Numbers

The 6 -th tri...

Question

The 6-th triangular number is:

A. 6

B. 10

C. 21

D. 28

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Solution

The sixth triangular number is 1 + 2 + 3 + 4 + 5 + 6 = 21

Hence, the correct answer is C.

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Adding Triangular Numbers

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