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From a class of 25 students, 10 students...

From a class of 25 students, 10 students are to be chosen for an excursion party , There are 4 students who decide that either all of them will join or none of them will join . In how many ways can the excursion party be chosen?

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The correct Answer is:
`""^(22)C_(7)+""^(22)C_(10)`
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