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Question

If 40Cn+7=40C4n2, then all the values of n are given by

A
28
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B
3,6
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C
3,7
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D
6
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Solution

The correct option is C 3,7
Here there are two conditions
n+7=4n2
3n=9
n=3
and,
n+7+4n2=40
5n+5=40
5n=35
n=7
There are two possible value of n . They are 3 and 7

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