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Two subjects are compulsory for a studen...

Two subjects are compulsory for a student in an examination. In how many ways can a student select 5 subjects out of given 10 subjects?

Text Solution

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Two subjects are compulsory.
`:.` No. of ways of selecting remaining 3 subjects from the remaining 8 subjects
`= .^(8)C_(3)`
`= (8!)/(3!5!) = 56`
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