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A polygon has 77 diagonals. The number o...

A polygon has 77 diagonals. The number of sides of the polygon is

A

14

B

9

C

10

D

11

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The correct Answer is:
A
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NEW JOYTHI PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE
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  2. The number of diagonals in a polygon of seven sides is

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  3. A polygon has 77 diagonals. The number of sides of the polygon is

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  4. If a set of m paralled lines intersect another set of n parallel lines...

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  5. Everybody in a room shakes hands with everybody else. The total n...

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  6. There are 10 points in a plane no three of which are collinear except ...

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  7. There are 10 true or false questions in an examination. Number of ways...

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  8. In an examination there are 4 multiple choice questions and each quest...

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  9. The number of ways in which 19 different objects can be divided into t...

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  10. The number of ways in which 12 people may be divided into three sets o...

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  11. The number of ways in which 10 people can be assigned to two triple an...

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  12. The vertices of a triangle are at the vertices of an octagon. The numb...

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  13. The number of rectangles in the following figure is

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  14. The number of ways in which 11 identical pencils can be distributed am...

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  15. The number of positive integral solutions of the equation x + y + z = ...

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  16. The number of whole number solutions of x + y + z = 20 is

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  17. A={(x,y,z):x,y,zinNandx+y+z=12}. The number of elements in A is

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  18. A box contains two white balls, three black balls and four balls. In...

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  19. The number of ways in which 21 objects can be grouped into three group...

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  20. The number of ways in which a couple can sit around a table with 6 gue...

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