Mathematics
NULL
Medium
Question
A box contains 3 blue, 4 red, 6 green and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either both blue or both yellow?
A
1/35
B
2/35
C
4/105
✓ Official correct answer
D
1/21
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
1/35
No member explanations yet for this option.
B
2/35
No member explanations yet for this option.
C
4/105
No member explanations yet for this option.
D
1/21
No member explanations yet for this option.
Explanation
Favourable = C(3,2) + C(2,2) = 4; total = C(15,2) = 105. Probability = 4/105.