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Class - 05 (Basic concept builder practice question - 4)
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Class - 04 (Basic concept builder practice question - 3)

## Bharat Gupta is teaching live on Unacademy Plus

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1. COMBINATION Practical Problem part 4 Follow Upvote

2. Problem for this lesson A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be selected so that there are at least two balls of each colour? a. 360 b. 400 . 425 d. 520 How many triangles can be formed by joining the vertices of a hexagon? a. 20 b. 12 C. 10 d. 36 How many chords can be drawn through 21 points on a circle? a. 120 b. 180 c. 210 d. 360 If 10 parallel lines in a plane are intersected by a family of 6 parallel lines. Find the number of parallelogram formed? a. 600 b. 675 c. 15 d. 120 There are 10 points in a plane, no three of which are in same straight line, except 4 points, which are collinear. Find the (i) number of straight lines obtained from these points a. 36 (ii) number of triangles formed from these points a. 120 b. 46 . 45 d. 40 b. 116 c. 150 d. 46

3. A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be selected so that there are at least two balls of each colour? a. 360 b. 400 c. 425 d. 520

4. A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be selected so that there are at least two balls of each colour? a. 360 b. 400 . 425 d. 520

5. A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be selected so that there are at least two balls of each colour? a. 360 b. 400 . 425 d. 520

6. How many triangles can be formed by joining the vertices of a hexagon? a. 20 b. 12 c. 10 d. 36

7. How many triangles can be formed by joining the vertices of a hexagon? a. 20 b. 12 c. 10 d. 36 To lorm 6 we

8. How many triangles can be formed by joining the vertices of a hexagon? a. 20 b. 12 c. 10 d. 36 6 To lorm we 20

9. How many chords can be drawn through 21 points on a circle? a. 120 b. 180 c. 210 d. 360

10. How many chords can be drawn through 21 points on a circle? a. 120 b. 180 c. 210 d. 360 DIW on Cr

11. If 10 parallel lines in a plane are intersected by a family of 6 parallel lines. Find the number of parallelogram formed? a. 600 b. 675 c. 15 d. 120

12. If 10 parallel lines in a plane are intersected by a family of 6 parallel lines. Find the number of parallelogram formed? a. 600 b. 675 c. 15 d. 120 Lino

13. There are 10 points in a plane, no three of which are in same straight line, except 4 points, which are collinear. Find the (i) number of straight lines obtained from these points a. 36 b. 46 C. 45 d. 40 No.dst a-tJ- Lino 1n, oinkin a 2. 2.

14. There are 10 points in a plane, no three of which are in same straight line, except 4 points, which are collinear. Find the (i) number of straight lines obtained from these points a. 36 b. 46 C. 45 d. 40 No reM

15. There are 10 points in a plane, no three of which are in same straight line, except 4 points, which are collinear. Find the (ii) number of triangles formed from these points a. 120 b. 116 c. 150 d. 46 n bo an coim

16. There are 10 points in a plane, no three of which are in same straight line, except 4 points, which are collinear. Find the (ii) number of triangles formed from these points a. 120 b. 116 c. 150 d. 46 3 3