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प्रश्न
Find the number of 4-digit numbers that can be formed using the digits 1, 2, 4, 5, 6, 8 if digits cannot be repeated
उत्तर
There are 6 different digits and we have to form 4-digit numbers, i.e., n = 6, r = 4.
If the repetition of digits is not allowed, then the number of 4-digit numbers
= 6P4
= `(6!)/(2!)`
= `(6 xx 5 xx 4 xx 3 xx 2!)/(2!)`
= 360.
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