How many 4 digit numbers can be formed using the digits 1 3 4 5 7 9 repetition is not allowed?
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taking 4 placeholders
on first placeholder : any of the 6 numbers can be used
second : any of the 5 can be used
third : 4
fourth : 3
so total will be 6 x 5 x 4 x 3 = 360 numbers are possible
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