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Question

If 113+1517+19+=π4, then the value of 11×3+15×7+19×11+ is

A
π8
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B
π6
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C
π4
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D
π36
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Solution

The correct option is A π8
We have,
π4=(113)+(1517)+(19111)+
=21×3+25×7+29×11+
11×3+15×7+19×11+=π8

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