Count the
D Repetition
id bepetation
numbear cé 3 digit numbers
numbers which can
be Boomed focom The
digit 2,4,68 is
of Digit is allowed
of the Digit is not allowed
Answers
Answer:
solution:
1. 3 digits formed from 2, 3, 5, 6, 7, 9
Permutation formula =
(n−r)!
n!
=
(6−3)!
6!
3
6
P=66×5×4
=120
2. Numbers less than 400 can start with digits 2 and 3 only.
2×6×6=72
3. Even numbers are 2 and 6 from the given 6 digits.
2×6×6=72
4. Odd numbers are 3, 5, and 7 from the given 6 digits.
6×6×3=108
5. 5 is the only digit from 6 digits have multiples of 5.
6×6×1=36.