Answer:
504 combos
Step-by-step explanation:
Cannot use digits twice and last is '7'
9 digits for first place choice
8 digits for second place
7 digits for third place
only '7' for fourth place 9 x 8 x7 = 504 combos
Answer:16
Step-by-step explanation:
Answer:
64
Step-by-step explanation
8 times 8 is 64 just write that down
