In how many ways can a person choose 1 or more of 4 electrical appliances

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QUESTION EXERCISE 5 (C) Q
Q.50) The number of ways in which a person can chose one or more of the four electrical appliances : T.V, Refrigerator, Washing Machine and a cooler is
a) 15 b) 25 c) 24 d) none of these Solution :

a person can chose one or more of the four electrical appliances : T.V, Refrigerator, Washing Machine and a cooler .
Number of selection one or more than one
= 4C1 + 4C2 + 4C3 + 4C4
= 24 - 4C0
= 16 - 1 = 15.
Answer : (a)