in how many different ways can 4 of 15 laboratory assistants be choosen to assist with an experiment
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Given : 15 laboratory assistants , 4 of 15 laboratory assistants be choosen to assist with an experiment
To Find : Number of Ways
Solution:
Total laboratory assistants = 15
laboratory assistants to be selected = 4
Number of ways of selecting 4 laboratory assistants to assist with an experiment ( order of selection does not matter )
= ¹⁵C₄
= 15!/11!.4!
= 15 * 14 * 13 * 12 / ( 4 * 3 * 2 * 1)
= 15 * 7 * 13
= 105 * 13
= 1365
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