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In how many ways can four people line up in a straight line if the youngest person cannot be first in line?

 Jun 18, 2021
 #1
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i got 18 guys. 3*3*2, because if u use a b c d as the people, d is youngest so 12*2-6=24-6=18indecision

 Jun 18, 2021
 #2
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ALL of the possible ways for the four people to line up would be    4 x 3 x 2 x 1 = 24     BUT   1/4 would need to be excluded from the count because the youngest would be first in 1/4 of the line ups        sooooo    3/4 * 24 = 18 ways

 Jun 18, 2021

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