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Question

Express 49 as the sum of 7 odd numbers.
Express 121 as the sum of 11 odd numbers.

A
1+3+5+7+9+11
1+3+5+7+9+11+13+15+19
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B
1+3+5+7+9+11+13
1+3+5+7+9+11+13+15+19+21
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C
1+3+5+7+9+11
1+3+5+7+9+11+13+15+19+21
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D
1+3+5+7+9+11+13
1+3+5+7+9+11+13+15+19
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Solution

The correct option is B 1+3+5+7+9+11+13
1+3+5+7+9+11+13+15+19+21
49=72= sum of first 7 odd numbers.
So, 49=1+3+5+7+9+11+13.
Similarly, 121=112= sum of first 11 odd numbers.
So, 121=1+3+5+7+9+11+13+15+19+21

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