From a group of persons the number of ways of selecting 5 persons is equal to that of 8 persons. No of ways of selecting 2 persons is.....

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From a group of persons the number of ways of selecting 5 persons is equal to that of 8 persons. No of ways of selecting 2 persons is.....

ONAGASAI DURGA02 17th Nov, 2018

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Vikas gehlot 18th Nov, 2018

The number of ways of selecting r person out of n is nCr

As per your question we can write mathematically the given condition in the form of equations as shown below

nC5=nC8

Where n is the number of persons

On solving

n=13

Now the required answer can be found by calculating 13C2

Therefore 13C2=78

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