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Question

Evaluate: 12+1+13+2+14+3+...1100+99

A
9
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B
10
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C
11
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D
0
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Solution

The correct option is B 9
12+1=21(2+1)(21)=2121=21
Similarly, 13+2=32,
14+3=43,
199+98=9998,
1100+99=10099

Given exp. =21+32+43+....+9998+10099
=1001=101=9.

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