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Question

Find the value of (5+7+9+11+13).

A
45
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B
49
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C
36
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D
39
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Solution

The correct option is A 45
Sum of first n odd numbers =n2

1+3+5+7+9+11+13=72=49

1+3=22=4

5+7+9+11+13=(1+3+5+7+9+11+13)(1+3)
=494=45

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