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- Question
A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
Options- A. 10/21
- B. 11/21
- C. 1/2
- D. 2/7
- Correct Answer
- 10/21
ExplanationTotal number of balls = (2 + 3 + 2) = 7.
Let S be the sample space.
Then, n(S) = Number of ways of drawing 2 balls out of 7 = = 21
Let E = Event of drawing 2 balls, none of which is blue.
n(E) = Number of ways of drawing 2 balls out of (2 + 3) balls = = 10
Therefore, P(E) = n(E)/n(S) = 10/ 21.
- 1. If sum of ? 1664 is divided between P and Q in the ratio of 1/3 : 1/5, then find P's share?
Options- A. 1085
- B. 1015
- C. 1090
- D. 1040 Discuss
- 2. In a competitive examination in State A, 6% candidates got selected from the total appeared candidates. State B had an equal number of candidates appeared and 7% candidates got selected with 80 more candidates got selected than A. What was the number of candidates appeared from each State ?
Options- A. 4000
- B. 8000
- C. 12000
- D. 16000 Discuss
- 3. 63.5% of 8924.2 +? % of 5324.4 = 6827.5862
Options- A. 28
- B. 22
- C. 18
- D. 12 Discuss
- 4. 445 of 229.79 = ? of 2398.51
Options- A. 23/50
- B. 36/49
- C. 33/41
- D. 29/47 Discuss
- 5. If the numerator of a fraction is increased by 150% and the denominator of the fraction is increased by 350%, the resultant fraction is 25/51. What is the original fraction ?
Options- A. 31/25
- B. 15/17
- C. 14/25
- D. 11/16 Discuss
- 6. The marked price of a shirt is Rs 1280. If the shirt is being sold for Rs 900, then what is the discount percentage?
Options- A. 31.31
- B. 25.57
- C. 29.68
- D. 34.36 Discuss
- 7. Out of 120 applications for a post, 70 are males and 80 have a driver's licences . What is the ratio between the minimum to maximum number number of males having driver's license?
Options- A. 1 : 3
- B. 2 : 3
- C. 3 : 7
- D. 5 : 7 Discuss
- 8. A number is increased by 20% and then decreased by 20%, the final value of the number is ?
Options- A. increase by 2%
- B. decrease by 3%
- C. decrease by 4%
- D. increase by 5% Discuss
- 9. Dot cabs company provides cabs for software employees. The company has 8 Swift dzires, 6 Scorpios, 7 Innovas and few small cars. If Swift dzire makes one fourth of the total fleet, how many small cars are there in the company ?
Options- A. 9
- B. 10
- C. 11
- D. 12 Discuss
- 10. If x/2y = 6/7, then find the value of (x - y) / (x + y) + 14/19?
Options- A. 5
- B. 1
- C. 4
- D. 3 Discuss
More questions
Correct Answer: 1040
Explanation:
Given that P's share : Q 's share = 1/3 : 1/5 = 5 : 3
Here, a = 5, b = 3, N = 1664
P's share = a/(a + b) x N
? = 5/(5 + 3) x 1664 = (5/8) x 1664 = ? 1040
Correct Answer: 8000
Explanation:
Let the number of candidates appeared from each state be x.
In state A, 6% candidates got selected from the total appeared candidates
In state B, 7% candidates got selected from the total appeared candidates
But in State B, 80 more candidates got selected than State A
From these, it is clear that 1% of the total appeared candidates in State B = 80
=> total appeared candidates in State B = 80 x 100 = 8000
=> total appeared candidates in State A = total appeared candidates in State B = 8000
Correct Answer: 22
Explanation:
63.5% of 8924.2 +? % of 5324.4 = 6827.5862
=> 63.5% of 8925 + ? % of 5325 = 6830
=> 6830 ~= 5320 + ?(5325)/100
=> ? ~= 22
Correct Answer: 23/50
Explanation:
Given
Correct Answer: 15/17
Explanation:
The original fraction is = 15/17.
Correct Answer: 29.68
Correct Answer: 3 : 7
Explanation:
Since there are 70 males out of 120 applicants, there must be 50 females out must have For the minimum number of males to have a driver's licence all 50 females must have a driver's license Thus the number of males having a driver's licence will be 80 - 50 = 30. The maximum possible number of males having a driver's license is 70. The ratio between the minimum and the maximum is 30 : 70 or 3 : 7 .
Correct Answer: decrease by 4%
Explanation:
Here, x = 20 and y = - 20
Therefore, the net % change in value
=
%
=
% or - 4%
Since the sign is negative, there is a decrease in value by 4%.
Correct Answer: 11
Explanation:
Given the company has 8 SD + 6 SRP + 7 IN = 21 cars + 'x' small cars.
Given SD makes 1/4 th of the total fleet.
=> 8 = 1/4 (21 + x)
=> 32 = 21 + x
=> x = 11
Therefore, the company has 11 small cars.
Correct Answer: 1
Explanation:
Given that, x/2y = 6/7
? x/y = 12/7
By componenod dividendo,
(x - y) / (x + y) = (12 - 7) / (12 + 7) = 5/19
? (x - y) / (x + y) + 14 /19 = 5/19 + 14/19 = 19/19 = 1
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