Question

Q4. Without adding find the sum :-
1) 1+3+5 +7 + 9 + 11 +13 + 15 + 17 + 19
2) 1+3+5+7 + 9 + 11 + 13 + 15​

Answer 1

$(10) ^{2} = 100$

2.

$(8) ^{2} = 64$

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Answer 2

Answer:

1 answer=100

2answer=64