Exercise problems XIV — task. Mathematics CBSE, Class 8.

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Without adding find the sum.

1.

$1+3+5+7+9$

The sum of

$1+3+5+7+9$ is .

2.

$1+3+5+7+9+11+13+15+ 17+19$

The sum of

$1+3+5+7+9+11+13+15+ 17+19$ is .

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