Question

Account numbers for Northern Oil Company consist of five digits, If the first digit cannot be a 0, how many account numbers are possible?

Answer 1

for the first slot, how many numbers do you have to choose from?

Answer 2

what do you mean

Answer 3

Say you have these 5 blank (for now) slots

Answer 4

ok

Answer 5

in each slot could go numbers to make up the 5 digits

so say you plug in 4, 1, 2, 6, 7