Quant timed Practice Medium Secrion 2 Parctice Test 1

GRE Quant Problem Solving
1

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can represent the event s like - SSDDC
total ways of arrangements = 5!/(2! . 2!) = 30
arrangements in which SS and DD are together - treat SS as one and DD as one , - 3! = 6
arrangements in which SS and DD are not together = 30 - 6 =24

What is wrong in my approach here???

2

Ask yourself if those two are really complements of each other.

For example, you don’t subtract a case like SDDSC, which is not valid because the dances are together.