Robertwellson
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- Joined
- Jun 11, 2020
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- 22
The first digit of a 3-digit number can't be 0, but the rest can.
Why can't I use 0?The first digit of a 3-digit number can't be 0, but the rest can.
There are 6 possible first digits; then 6 for the second (any but whatever was used in the first), and then 5 for the third. So 6*6*5 = 180.
Now show your attempt for (b).
Oh I understand it now, thank you for your help, we can't use 0 as the first number because for example 013 is technically 13. For b is 2*6P2 =60Why can't I use 0?
Correct on both. For (b), we could also say it is 2*6*5.Oh I understand it now, thank you for your help, we can't use 0 as the first number because for example 013 is technically 13. For b is 2*6P2 =60