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Express: 49 as the sum of 7 0dd natural ...

Express: 49 as the sum of 7 0dd natural numbers. 121 as the sum of 11 odd natural numbers.

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`49` is square of `7`.Therefore, its sum will be of first 7 odd natural numbers.
`1+3+5+7+9+11+13`

`121` is square of `11`.Therefire, its sum will be of first `11` odd natural numbers.
`1+3+5+7+9+11+13+15+17+19+21`.
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