Answer:
5040 ways
Step-by-step explanation:
In solving this problem we will use the method of permutations.
The formula for permutation is
nPr = n!/(n-r)!
Back to our question, we are required to choose 4 digits out of 10 digits. Now in solving this:
The number of ways of selecting 4 digits from 10 digits
= 10P4
= 10!/(10-4)!
= 10!/6!
= 10x9x8x7x6!/6!
= 5040 ways
Note that 6! on the numerator cancels out 6! On the denominator.
