Question

Four digit numbers are to be formed using the digits 1234

Answer 1

there are many numbers you can form
largest digit number =4321
smallest digit number =1234
other 3214 1243 2341 etc

Answer 2

You have to form a 4 Digit number using the digits 1,2,3,4 . there are many numbers like 1234,4321,1243,4312 etc. So how can we say that how much no. Should we formed, we formed (1×2×3×4) =24.