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Question

The sum of 12+1+13+2+14+3+.....+1100+99 is equal to



Correct Answer
A

9

Your Answer
B

10

Your Answer
C

11

Your Answer
D

1


Solution

The correct option is A

9


12+1=12+1×2121=21(2)21=21=13+2=13+2×3232=32(3)2(2)2=32Similarly,14+3=43,......1100+99=10099By adding, we get12+1+13+2+14+3+.....+1100+99=1001=101=9.

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