Inactive Tutor answered • 05/04/21
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b) without repetition: 10!/(10-4)! =10!/6! = 10x9x8x7x6!/6! = 10x9x8x7 =90x56 = 5,004
a) with repetition: 10^4 =10x10x10x10 = 10,000
Kate O.
asked • 05/04/21permutations help!
1.how many 4digit numbers can be formed with
a) repetition and b) without it
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Inactive Tutor
VERY IMPORTANT: How is a number with leading zeros considered. That is, is 0021 a four-digit number or is it a two-digit number??05/04/21