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Question

For the given equation 10Cr+2 10Cr1+ 10Cr2= 12Cs, which of the following is/are correct?

A
If r=s, then the possible number of solutions is 13
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B
If rs, then the possible number of solutions is 12
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C
If r=s, then the possible number of solutions is 9
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D
If rs, then the possible number of solutions is 8
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Solution

The correct option is D If rs, then the possible number of solutions is 8
Given : 10Cr+2 10Cr1+ 10Cr2= 12Cs
For combination to be defined
10r2
Now,
10Cr+ 10Cr1+ 10Cr1+ 10Cr2= 11Cr+ 11Cr1= 12Cr
Therefore,
12Cr= 12Cs
When r=s, then
r=2,3,4,5,6,7,8,9,10
The number of solutions is 9

When r+s=12, then
(r,s)=(2,10),(3,9),(4,8),(5,7),(7,5),(8,4),(9,3),(10,2)
The number of solutions is 8

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