Q14 of 68 Page 330

From a class of 25 students, 4 are to be chosen for a competition. In how many ways can this be done?

This is a case of combination:


Here,


n=25


r=4


⇒ nCr= 25C4


⇒25C4=


⇒25C4=


⇒25C4=


⇒25C4=


⇒25C4=12650 possible ways.


Ans:In 12650 ways ,from a class of 25 students, 4 can be chosen for a competition.


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