Question

seventh triangular no.​

Answer 1

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here is your answer....

0,1,3,6,10........

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Answer 2

Step-by-step explanation:

all

No odd perfect numbers are known, hence all known perfect numbers aretriangular. For example, the thirdtriangular number is (3 × 2 =) 6, theseventh is (7 × 4 =) 28, the 31st is (31 × 16 =) 496, and the 127th is (127 × 64 =) 8128.

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