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- Question
- An urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. What is the probability that the ball drawn is not red?
Options- A. 1/11
- B. 9/20
- C. 2/11
- D. 11/20
- Correct Answer
- 11/20
ExplanationP (red) = 9 / (9 + 7 + 4) = 9/20
? P(not-red) = (1 - 9/20) = 11/20 - 1. A box contains 2 blue balls, 3 green balls and 4 yellow balls. In how many ways can 3 balls be drawn from the box, if at least one green ball is to be included in the draw?
Options- A. 48
- B. 24
- C. 64
- D. 32 Discuss
- 2. How many 100 digit positive number are there?
Options- A. 9 × 1099
- B. 9 × 10100
- C. 10100
- D. 11 × 1098 Discuss
- 3. The cash difference between the selling price of an article at a profit of 4% and 6% is Rs. 3. The ratio of two selling prices is:
Options- A. 51:53
- B. 55:53
- C. 52:53
- D. 54:53 Discuss
- 4. If sin? x cos? = 1?2 . The value of sin? - cos? is where 0°< ?< 90°
Options- A. 0
- B. ?2
- C. 2
- D. 1 Discuss
- 5. The length of two parallel sides of a trapezium are 18 m and 24 m. If its height is 12 m, then what is the area (in sq.m) of the trapezium?
Options- A. 126
- B. 252
- C. 504
- D. 1024 Discuss
- 6. Out of 6 green ball, 4 blue ball, in how many ways we selectone or more balls ?
Options- A. 42
- B. 34
- C. 31
- D. 22 Discuss
- 7. What is the unit digit of (217)413 × (819)547 × (414)624 × (342)812?
Options- A. 2
- B. 4
- C. 6
- D. 8 Discuss
- 8. In ?PQR , straight line parallel to the base QR cuts PQ at X and PR at Y. If PX:XQ = 5:6, then the XY:QR will be
Options- A. 5:11
- B. 6:5
- C. 11:6
- D. 11:5 Discuss
- 9. If a3+1a3 = 2, then the value of a2+1a ?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 10. PQRS is a cyclic quadrilateral and PQ is the diameter of the circle. If ?RPQ = 38°, then what is the value (in degrees) of ?PSR?
Options- A. 52
- B. 77
- C. 128
- D. 142 Discuss
More questions
Correct Answer: 64
Explanation:
Total number of balls = 2 + 3 + 4 = 9
Total number of ways 3 balls can be drawn from 9 = 9C3
No green ball is drawn = 9 - 3 = 6 = 6C3
Required number of ways if atleast one green ball is to be included = Total number of ways - No green ball is drawn
= 9C3 - 6C3
= 9x8x7/3x2 - 6x5x4/3x2
= 84 - 20
= 64 ways.
Correct Answer: 9 × 1099
Correct Answer: 52:53
Correct Answer: 0
Correct Answer: 252
Correct Answer: 34
Explanation:
7 × 5 = 35
35 ? 1 = 34
Correct Answer: 8
Correct Answer: 5:11
Correct Answer: 2
Correct Answer: 128
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