about 13
3*3*2*1 = 18
there are 899 whole numbers that have three digits.
24
There are 5*4*3 = 60 such numbers.
about 13
With repeated digits, 43 = 64 Without repeated digits, 4*3*2 = 24
6: 146, 164, 416, 461, 614, and 641.
3*3*2*1 = 18
there are 899 whole numbers that have three digits.
525
Numbers above 99 and under 1000 are 3-digits, all 900 of them.
24
There are 5*4*3 = 60 such numbers.
Using only arrangements of the given digits: without repeating digits, 15. with repetition, 39. The answer does not include numbers such as 2^3 = 8 or 3^(2+1) = 27
900
1,956 different numbers can be made from 6 digits. You can calculate this by using the permutation function in a summation function, like this: Σ6k=1 6Pk = 6P1+6P2+...+6P5+6P6 What this does is calculate how many 1 digit numbers you can make from 6 digits, then how many 2 digit numbers can be made from 6 digits and adds the amounts together, then calculates how many 3 digit numbers can be made and adds that on as well etc.