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Question

If 18C2r= 18Cr+3, then the value of r is/are

A
2
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B
3
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C
4
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D
5
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Solution

The correct option is D 5
Given 18C2r= 18Cr+3
Now, we know that
2r=r+3 or 2r+r+3=18r=3,5

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