Mother, father and son line up at random for a family picture E: son on one end, F: father in middle

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#### Solution

If mother (M), father (F), and son (S) line up for the family picture, then the sample space will be

S = {MFS, MSF, FMS, FSM, SMF, SFM}

⇒ E = {MFS, FMS, SMF, SFM}

F = {MFS, SFM}

∴ E ∩ F = {MFS, SFM}

Concept: Conditional Probability

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