Question

Counting numbers are to be formed using only the digits 8, 5, 1, 7, 3, and 6. Determine the number of different possibilities for two-digit numbers. ___ numbers (simplify your answer. Type a whole number.)

Answer 1

Find out the permutation 2P6

so

$2P6=\frac{6!}{(6-2)!}=30$

the answer is 30 numbers