Step-by-step explanation:
John always wears a shirt, pants, socks, and shoes. He owns 12 pairs of socks, 3 pairs of shoes, 5 pairs of pants, and 5 shirts.
For example If John has 2 pants and 3 shirts
he make an combination of 1 pant with 3 shirts
and another pant with 3 shirts
so total of 6 combination he can make (2*3)= 6
To find the number of combination we multiply all the shirt, pants, socks, and shoes he have
12pairs of socks, 3 pairs of shoes, 5 pairs of pants, and 5 shirts.
12 * 3 * 5 * 5 = 900
So 900 different combination John can make