Q. 155.0( 1 Vote )

# A child has plast

Given: We have toys with bearing 4, 4 and 5

To Find: Number of 3-digit numbers he can make

The formula used: The number of permutations of n objects, where p1 objects are of one kind, p2 are of the second kind, ..., pk is of a kth kind and the rest, if any, are of a different kind is

The child has to form a 3-digit number.

Here the child has two 4’s.

We have to use the above formula

Where,

n=3

p1=2

The numbers are 544, 454 and 445.

He can make 3 3-digit numbers.

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