Question

Find the sum of the following numbers without actually adding the numbers.

(i) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15
(ii) 1 + 3 + 5 + 7
(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17

Answer 1

hey the answer is .......

sum of odd numbers is the square of the place of that digit .....


i) 1 + 3 + 5+ 7+9+ 11 + 13 +15 = 64 = 8^2

ii) 1+3+5 +7 = 16 = 4^2


iii) 1+3+5+7+9+ 11 +13 +15 +17 = 81 = 9^2




hope it helps uu frnd ☺☺☺

Answer 2

Hey Mate ,

Here is the answer ,
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(i) 1+3+5+7+9+11+13+15
    = 8²
    =64

(ii) 1+3+5+7
     = 4²
     = 16

(ii) 1+3+5+7+9+11+13+15+17
    = 9²
    = 81
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Hope this helped you !!
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