He has 6 choices for the top, 5 choices for the second, 5 choices for the bottom. So the number of permutations is 6 x 5 x 5 = 150
Camille C.
asked • 03/27/19Permutation question
Justin knits socks for a charity. He likes to make striped socks and selects from six different colours. The top stripe can be any color. The second stripe may not match the first color. The bottom color may not match the second, but may match the first color. How many distinct pairs of socks could Justin make?
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