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Question

The value of 12+7+17+10+...+128+31 is?

A
4283
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B
2313
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C
2843
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D
3123
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Solution

The correct option is D 3123
12+7+17+10+...........+128+31

=(12+7×2727)+(17+10×710710)+..........+(128+31×28312831)

=2747+710710+........+28312831

=(23+73)+(73+103)+........+(283+313)

=23+313

=3123


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