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Question

If I1=21x(x+3x)dx and I2=21(x+3x)dx, then I1I2=

A
12
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B
32
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C
2
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D
1
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Solution

The correct option is B 32
I1=21x(x+3x)dx
I1=21(3x)(x+3x)dx
I1=3I2I1
2I1=3I2
I1I2=32

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