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A man has 7 friends. In how many ways ca...

A man has 7 friends. In how many ways can he invite one or more of them to a party?

A

a. 270

B

b. 128

C

c. 127

D

d. 277

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A
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ARIHANT SSC-PERMUTATIONS & COMBINATIONS -INTRODUCTORY EXERCISE -(19.5 )
  1. A man has 12 friends of whom 8 are relatives.How many ways he can invi...

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  2. If there are 11 players in a cricket team, all of whom shake hands wit...

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  3. A man has 7 friends. In how many ways can he invite one or more of the...

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  4. A shop sells 6 different flavors of ice-creams. In how many ways can a...

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  5. In how many ways can a cricket team of 11 players be chosen out of a b...

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  6. Everybody in a room shakes hands with everybody else. The total number...

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  7. In how many ways can a cricket team of eleven players be chosen out of...

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  8. In how many ways can a cricket team of 11 players be chosen out of a b...

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  9. A cricket team of 11 players is to be formed from 16 players including...

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  10. A cricket team of 11 players is to be selected from 16 players includi...

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  11. ABCD is a cyclic quadrilateral such that AB is a diameter of the circl...

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  12. Out of 3 books on Economics , 4 books on corpora's strategy an...

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  13. There are 3 books of mathematics, 4 of science and 5 of literature. Ho...

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  14. A box contains 7 red, 6 white and 4 blue balls. How many selection of ...

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  15. If the measure of each interior angle of a regular polygon be 144 degr...

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  16. There are 3 books of mathematics, 4 of science and 5 of literature. Ho...

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  17. An urn contains 5 different red and 6 different green balls. In how ma...

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  18. Find the number of straight lines formed by joining 6 different points...

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  19. How many different straight lines can be formed by joining 12 differen...

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  20. Find the number of diagonals in a decagon.

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