Answer :
There are 3 x 2 x 2 x 1 = 12 possible ways to give t-shirts to the four people.
Here, there are 3 choices for the first person's shirt color, and 2 choices for the second person's shirt color (since they cannot wear the same color as the first person). This gives 3 × 2 = 6 total options for the first two people. For the third person, there are 2 choices for their shirt color (since they cannot wear the same color as either of the first two people). This gives a total of 6 × 2 = 12 options for the first three people. Finally, the fourth person has only 1 choice for their shirt color (since they cannot wear the same color as any of the previous three people). This gives a total of 12 × 1 = 12 options for all four people. Therefore, there are 12 total ways to give t-shirts to the four people.
These are the possible combinations:
Red, Blue, Green, Yellow
Red, Blue, Yellow, Green
Red, Green, Blue, Yellow
Red, Green, Yellow, Blue
Red, Yellow, Blue, Green
Red, Yellow, Green, Blue
Blue, Red, Green, Yellow
Blue, Red, Yellow, Green
Blue, Green, Red, Yellow
Blue, Green, Yellow, Red
Blue, Yellow, Red, Green
Blue, Yellow, Green, Red
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