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B
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Difficulty:
65%
(hard)
Question Stats:
57% (02:32) correct
43%
(02:27)
wrong
based on 50
sessions
History
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There are total 10 balls in a jar , 8 of them are unique and 9th and 10th ball both have same color. In how many ways can we pick 5 balls from the jar if same color balls are not allowed in the 5 balls set?
a. 170
b. 196
c. 182
d. 252
e. 186
can someone explain this problem ? Thanks
a. 170
b. 196
c. 182
d. 252
e. 186
can someone explain this problem ? Thanks
26 Feb 2020, 08:19
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jackfr2
There are total 10 balls in a jar , 8 of them are unique and 9th and 10th ball both have same color. In how many ways can we pick 5 balls from the jar if same color balls are not allowed in the 5 balls set?
a. 170
b. 196
c. 182
d. 252
e. 186
can someone explain this problem ? Thanks
a. 170
b. 196
c. 182
d. 252
e. 186
can someone explain this problem ? Thanks
Total Ways to pick 5 out of 10 balls = 10C5 = 252
Ways to pick 5 balls so that same color balls are always in selected group of 5 balls = 8C3 = 56
Favorable cases = 252 - 56 = 196
Answer: Option B
Updated on: 26 Feb 2020, 16:08
Originally posted by newyork2012 on 26 Feb 2020, 09:44.
Last edited by newyork2012 on 26 Feb 2020, 16:08, edited 1 time in total.
Last edited by newyork2012 on 26 Feb 2020, 16:08, edited 1 time in total.
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