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Val takes her four sons, Hal, Cal, Sal and Mal, to get their hair cut. It's crowded, so there's only time for two of them to get a haircut. Val has to decide who goes first and who goes second. Below are her choices. Which ones are missing? H then C ? C then H S then H M then H C then S S then C M then C H then M C then M ? M then S ​

Respuesta :

The missing choices are S then M and M then S.

Here's the breakdown:

Val has 4 sons: Hal (H), Cal (C), Sal (S), and Mal (M).
She needs to choose 2 out of 4 for haircuts.
The order matters (who goes first and who goes second).
We see all the combinations for the following pairings:

Val and Hal (H)
Val and Cal (C)
Val and Sal (S)
Val and Mal (M)
Therefore, the missing combinations are the two remaining options where Sal (S) and Mal (M) are paired together:

S then M
M then S

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