Question

find the answer
1+3+5+7+9+11+13+15
without actually adding the numbers

Answer 1

it is very simple
just you have to add the numbers and yo you have to square it

i.e there are 8 numbers so,
8^2 = 64

HOPE IT HELPS YOU AND
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Answer 2

count the numbers =1+3+5+7+9+11+13+15=8

So the square of 8 is 64.

so,without adding we found,

the answer