Question

a well shuffled deck of cards is taken . what is the probability of drawing 2 cards which is a spade or a red?​

Answer 1

total no cards = 52

no of spade = 13,  probability of spade= 13/52⇒1/4

no of red = 26, probability of red = 26/52⇒1/2

probability of spade or red =  1/4×1/4+1/4×1/2+1/2×1/4+1/2×1/2

                                            = 1/16+1/8+1/8+1/4

                                            = (1+2+2+4)/16

                                           =  9/16                   ANS.

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