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Question

What is the value of 11+2+12+3+13+4..... upto 15 terms?

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 3
By rationalising each term,
11+2=12+1×2121=2121=21
12+3=13+2×3232=3232
=32
............................
115+4=14+15×415415=4151615
=415
Given expression
=(21)+(32)+.....+415
=41=3.

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