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The number of positive integers which can be formed by using any number of digits from 0,1,2,3,4,5 without repetition?
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6!*5!*4!*3!*2!*1! Ways
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You can form
1 digit positive numbers = 5
2 digit positive numbers = 25.
3 digit positive numbers = 100.
4 digit positive numbers = 300.
5 digit positive numbers = 600.
Six digit positive numbers = 600.
So, total positive numbers,
= 5+25+100+300+600+600
= 1630