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Triangular numbers are numbers that are formed from the sum 1+2+3+4...

The equation for the nth triangle number is (n2+n)/2

In this case, we want the sixth triangle number, so feed this into the equation:

(62+6)/2

=(36+6)/2

=42/2

=21

Thus the sixth triangle number is 21.

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13y ago

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Anonymous

Lvl 1
4y ago

21

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Q: What is the sixth triangular number?
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