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There are 10 points on a plane of which ...

There are 10 points on a plane of which 5 points are collinear. Also, no three of the remaining 5 points are collinear. Then find (i) the number of straight lines joining these points: (ii) the number of triangles, formed by joining these points.

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The correct Answer is:
(i) 36 (ii) 110
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NAGEEN PRAKASHAN ENGLISH-PERMUTATION AND COMBINATION -Exercise G
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  2. How many words can be formed with 3 vowels and 2 consonants taken from...

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  3. There are 10 points on a plane of which 5 points are collinear. Also, ...

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  4. There are 16 points in a plane of which 6 points are collinear and no ...

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  5. No. of diagonals of a hexagon are:

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  6. Find the number of diagonals of a 16-sided polygon.

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  7. (i) Find the number of sides of a polygon if it has 35 diagonals. (i...

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  8. In how many ways can 7 red and 6 black balls be arranged in a row, if ...

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  9. In how many ways can 12 white and 8 black balls be arranged in a row i...

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  10. A person invites a group of 10 friends at dinner and seats (i) 5 on ...

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  14. How many factors are there of the number 2520?

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  17. There are 4 red, 3 black and 5 white balls in a bag. Find the number o...

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  18. There are 4 white, 3 black and 3 red balls in a bag. Find the number o...

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  20. Find the number oif different sums that can be formed with one rupee, ...

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