Question

what is 8 triangular number

Answer 1

   

$8^{th}\ triangular number is \ \ \frac{8 \times 9}{2} = \frac{72}{2}=\bold{36} \\ \\ \\ 1+2+3+4+5+6+7+8=\bold{36}$

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Answer 2

ith triangular no. = 1+3+6+10+15+21+28+36=120

Answer= 120