Three boys and three girls are arranged at random in a row. What is the probability that all three boys are standing next to each other?
+310 Put all the three boys as one block. In the block, they can be arranged in 3x2x1=6 ways. Then the arrangment for four people (the three girls and one block of boys) is 4x3x2x1=24.
Multiply 6x24 to get our answer, 144.
