CAT Exam

A bag contains 4 white balls and 5 balck balls.3 balls are drawn at random.What is the odd against aa black?

Read Solution (Total 4)

Total number of choices= 9C3=84
Against black = Total number of choices-Probability of getting black
Probability for black=5C3=10
so (against black) 84-10=74
Odds against black=No.of unfavorable choices:no.of favorable choices
So=74:10 will be the answer.
11 years agoHelpfull: Yes(4) No(2)

supryapryange has explained the question right but then at the end she has made a mistake so the right answer is74:84.
11 years agoHelpfull: Yes(1) No(0)
sorry the answer will be 74:84
11 years agoHelpfull: Yes(0) No(0)
odd against black=(formula for odd against m/(n-m))
10/84-10=10:74
11 years agoHelpfull: Yes(0) No(1)

CAT Other Question

There are 4 white balls and 5 black balls.3 balls are drawn at random.What is probability of odds against all black Ramu is 75% than gokul .if Ramu heightt increasess by 40% while gokul increases only by 25%, by what percent is Ramu taller than gokul now?