Question
Question: How many numbers, lying between 99 and 1000 be made from the digits 2, 3, 7, 0, 8, 6 when the digits...
How many numbers, lying between 99 and 1000 be made from the digits 2, 3, 7, 0, 8, 6 when the digits occur only once in each number.
A
100
B
90
C
120
D
80
Answer
100
Explanation
Solution
Required number of ways
= 6P3−5⥂P2=120−20=100.
{Since between 99 and 1000, the numbers are of 3 digits, but those numbers should be omit in which ‘0’ comes at hundred place}.