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A school library has 75 books on Mathema...

A school library has 75 books on Mathematics, 35 books on physics. A student can choose only one book , In how many ways a student can choose a book on Mathematics or physics?

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The correct Answer is:
`75+35=110`
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FULL MARKS-COMBINATORICS AND MATHEMATICAL INDUCTION-ADDITIONAL QUESTIONS
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  13. Find the number of 4-digit numbers that can be formed using the digits...

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  14. Iff ""^(5)P(r)=""^(6)P(r-1) find r.

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  18. Using the digits 1,2,3,4,5,6,7 a number of 4 different digits is forme...

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  19. If ""^(22)P(r+1):^(20)P(r+2)=11:52, find r.

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  20. If ""^(nP(r)=""^(n)P(r+1) and ""^(n)C(r)=""^(n)C(r-1) find n and r.

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