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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?

 Jun 20, 2020
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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. 

 Jun 20, 2020

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