From a class of 25 persons 10 persons are to be chosen for an excursion party there are 3 students who decide that either all of them will join or none of them will join in how many ways can the excursion party is chosen
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if none of the 3 are joined, = 22C10
if all the 3 join, = 22C7
total = 22C10 + 22C7
if all the 3 join, = 22C7
total = 22C10 + 22C7
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