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if n persons are seated in row the number of ways of selecting 3 so that no two r seated next to each other
Dear Shiwani,
Required Prob, = select 3 persons from n - consider 2 persons sitting together as one so total persons are n-1 and now select 3 persons from n-1
= nC3 - (n-1)C3*2
Note : (n-1)C3*2 bcoz 2 persons can be arranged in two ways .
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