First slide

Permutations

Question

Let x be the number of 5 digit numbers sum of whose digits is even and y be the number of 5 digit numbers
sum of whose digits is odd, then

NA

A

x=y
B

x+y = 90,000
C

x= 45,000
D

x < y

Solution

x =9 x 10 x 10 x 10 x 5 = 45000
Similarly y= 45,000
x = y & x+y= 90,000

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