can someone help me out with this maths?
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648
Step-by-step explanation:
Using Permutations and combinations, we observe that:
the first digit maybe chosen from 0 to 9 i.e. 9 options.
Likewise the second spot maybe filled by numbers ranging from 0 to 9 and must not be the first digit i.e. 9 options
and the third slot may be filled in 8 ways (from numbers ranging from 0 to 9 but not equal to the first or second digit)
Therefore the number of numbers between 100 and 999 with all different digits is 9*9*8=648
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