Any four numbers, in this case 3,4,5 and 6, can be arranged 24 different ways , ie 4 x 3 x 2
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Any 3 out of 4 = 4. Each set can be arranged 6 ways so 24 different numbers.
7 + 2 + 2 5 + 3 + 3 5 + 2 + 2 + 2 2 + 3 + 3 + 3 2 + 2 + 2 + 2 + 3
4*3*2*1 = 24 ways.4*3*2*1 = 24 ways.4*3*2*1 = 24 ways.4*3*2*1 = 24 ways.
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
The 3 digit numbers under 500 are 100 through 499.