11
Q:

A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?

A) 6/145 B) 36/145
C) 18/95 D) 12/145

Answer:   B) 36/145



Explanation:
 

The probability that first ball is white:
=C112C130=1230=25


Since, the ball is not replaced; hence the number of balls left in bag is 29.
Hence the probability the second ball is black:
=C118C129=1829


Required probability =(25)×(1829)


=36/145

Q:

If sqrt x + frac{1}{sqrt x} = 2sqrt2, then x^2 + frac{1}{x^2} is equal to:

 

A) 36 B) 34
C) 32 D) 64
 
Answer & Explanation Answer: B) 34

Explanation:
Report Error

View Answer Report Error Discuss

1 13
Q:

If 'J' is coded as '20' and 'BAT” is coded as '46' then how will 'CRICKET' be coded?

A) 138 B) 158
C) 142 D) 140
 
Answer & Explanation Answer: A) 138

Explanation:
Report Error

View Answer Report Error Discuss

1 117
Q:

What is the value of x so that the seven digit number 8439x53 is divisible by 99?

 

A) 9 B) 4
C) 3 D) 6
 
Answer & Explanation Answer: B) 4

Explanation:
Report Error

View Answer Report Error Discuss

0 340
Q:

△ABC ∼ △NLM and ar(△ABC): ar(△NLM) = 4 : 9. If AB = 6 cm, BC = 8 cm and AC =12 cm, then ML is equal to:

 

A) 18 cm B) 9 cm
C) 6 cm D) 12 cm
 
Answer & Explanation Answer: D) 12 cm

Explanation:
Report Error

View Answer Report Error Discuss

0 366
Q:

If (5a - 3b) : (4a - 2b) = 2 : 3, then a : b is equal to:

 

A) 3 : 4 B) 2 : 3
C) 5 : 8 D) 5 : 7
 
Answer & Explanation Answer: D) 5 : 7

Explanation:
Report Error

View Answer Report Error Discuss

1 261
Q:

What is the value of x so that the seven digit number 55350x2 is divisible by 72?

 

A) 1 B) 8
C) 7 D) 3
 
Answer & Explanation Answer: C) 7

Explanation:
Report Error

View Answer Report Error Discuss

0 382
Q:

Walking frac{5}{7} of his usual speed, a person reaches his office 10 minutes later than the usual time. His usual time in minutes is:

 

A) 28 B) 30
C) 25 D) 35
 
Answer & Explanation Answer: C) 25

Explanation:
Report Error

View Answer Report Error Discuss

0 43
Q:

If a + b + c = 8 and ab + bc + ca = 20, then a^3 + b^3 + c^3 - 3abc is equal to:

 

A) 30 B) 24
C) 32 D) 36
 
Answer & Explanation Answer: C) 32

Explanation:
Report Error

View Answer Report Error Discuss

0 852