Question

Find how many four digit numbers can be formed using the digits 5,6,7,8 and 9 if;

(a) any of the digits can occur more than once

Answer 1

\[4^5\]

Answer 2

the answer is 625

Answer 3

??

Answer 4

oh sorry i wrote
\[4^5\] it is
\[5^4\]

Answer 5

why is it to the power of 4

Answer 6

you have 4 slots to fill
___ ____ ____ _____
5 choices for first slot, 5 for second, 5 for third, 5 for fouth

Answer 7

"counting principle" tells you the number of ways you can do it is
\[5\times 5\times 5\times 5\]

Answer 8

ok thanks :)

Answer 9

yw
i bet there is a b and c and d too

Answer 10

I've figured the others out lol