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Question

If a1,a2,,a15 are in A.P. and a1+a8+a15=15, then a2+a3+a8+a13+a14 equals


A

15

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B

10

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C

25

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D

33

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Solution

The correct option is C

25


a1+a8+a15=3a1+21d=15
a1+7d=5
Now, a2+a3+a8+a13+a14=5a1+35d
5(a1+7d)=5×5=25


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