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The number of five digit numbers that can be formed by using digits 1, 2, 3 only, such that three digits of the formed number are identical, is
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a
30
b
60
c
120
d
90
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Correct option is C
When exactly three digits are identical and the remaining two are different, then the number of such numbers 3C15!3!=60When three digits are identical and the remaining two are also identical, then the number of ways= 3C2(2)5!3!2!=60Thus, the number of such numbers = 120.Similar Questions
Let be a set containing elements. The number of reflexive relations that can be defined on is
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