Hamza and Grace are making 2-digit numbers.
The digit 0 is not used.
Hamza only uses odd digits and Grace only uses even digits.
a) Hamza can make x more codes than Grace.
Assume that digits cannot be repeated.
Work out the value of x.
Optional working
X =
b) In fact, digits can be repeated.
What does this tell you about the actual value of x?
A It is bigger than my answer to part a)
B It is smaller than my answer to part a)
C It is the same as my answer to part a)