Question

Without adding, find the sum of the following numbers
(i)1+3+5+7+9 =

(ii)1+359+ II + 13 + 15 + 17=

(iii)1+3+5+7+9+11 +13 + 15 + 17+19+21 +23+25=​

Answer 1

1.25

2.416

3.529

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