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36.

This is the eighth member of the series which can be calculated using the formula

(n2 + n) / 2.

Where n = 7 we have the triangular number 28 ((49 + 7) / 2).

The next number is where n = 8:

= (64 + 8) / 2 = 72/2 = 36.

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13y ago

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