A bag contains 5 red, 4 green and 3 black balls. It
three balls are drawn out of it at random find the
probability of drawing exactly 2 red balls.
(a) 7/22
(b) 7/12
(c) 10/33
(d) 7/11
Answers
Answered by
0
7/22
Step-by-step explanation:
All possible case in drawing 3 balls from 12 12C3=3!9!12!=220
Fovourable cases to draw exactly 2 red wall 5C2×7C1=2!3!5!×1!6!7!=70
Hence the required probability =22070=227
Answered by
0
Answer:
All possible case in drawing 3 balls from 12
12
C
3
=
3!9!
12!
=220
Fovourable cases to draw exactly 2 red wall
5
C
2
×
7
C
1
=
2!3!
5!
×
1!6!
7!
=70
Hence the required probability =
220
70
=
22
7
Step-by-step explanation:
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