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From a class of 15 students, 10 are to c...

From a class of 15 students, 10 are to chosen for a picnic. There are two students who decide that either both will join or none of them will join. In how many ways can the picnic be organized?

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The correct Answer is:
`13C_(10)+13C_(8)`
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CBSE COMPLEMENTARY MATERIAL-PERMUTATIONS AND COMBINATIONS -Section - C(Short answer type question)
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  2. 19.From a group of 7 boys and 5 girls, a team consisting of 4 boysand ...

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  3. In how many ways can one select a cricket team of eleven players from ...

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  4. 21.A student has to answer 10 questions, choosing at least 4 fromeach ...

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  5. Using the digits 0, 1, 2, 2, 3 how many numbers greater than 20000 c...

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  6. If the letters of the word ‘PRANAV' are arranged as in dictionary in a...

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  7. From a class of 15 students, 10 are to chosen for a picnic. There are ...

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  8. Using the letters of the word, 'ARRANGEMENT' how many different words ...

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  9. A polygon has 35 diagonal. Find the number of its sides.

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  10. How many different products can be obtained by multiplying two or more...

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  11. Determine the number of 5 cards combinations out of a pack of 52 cards...

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  12. How many words can be formed with the letters of the words ORDINATE ...

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  13. Find the number of all possible arrangements of the letters of the wor...

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  14. Prove that 33! Is divisible by 2^(19) and what is the largest integer ...

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  15. A group consists of 1 girls and 7 boys. In how many ways can a team of...

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  16. A group consists of 4 girls and 7 boys. In how many ways can a team of...

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  17. A group consists of 4 girls and 7 boys. In how many ways can a team of...

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  18. If ^n+2C8:^(n-2)P4: 57 : 16 , find ndot

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  19. In an election, these are ten candidates and four are to be elected. A...

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  20. Three married couples are to be seated in a row having six seats in a ...

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