How many 5-digit numbers without repetition of digits can be formed using the digits 0, 2, 4, 6, 8?
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The number of possibilities of ten-thousandth digit =
4
(0 is excluded because then the number does not become a 5-digit number)
The number of possibilities of thousandth digit =
4
(one digit gone but 0 included)
The number of possibilities of hundredth digit =
3
(two digits gone)
The number of possibilities of tenth digit =
2
(three digits gone)
The number of possibilities of units digit =
1
(four digits gone)
∴ Number of 5-digit numbers required = 4 × 4 × 3 × 2 × 1 = 9 6
Did the exact same
I did the same analysis. I find it more intuitive than Samara Simha Reddy's analysis.
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The five numbers can be arranged in 5 ! times = 1 2 0 .
And If zero is in front it is not considered as a five digit number, So keeping zero at first, The remaining four numbers can be arranged by 4 ! = 2 4 .
Therefore, Number of five digit numbers made using the numbers, = 1 2 0 − 2 4 = 9 6 .