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Question

Bag A contains 3 Red Marbles and 4 Blue Marbles.
Bag B contains 5 Red Marbles and 3 Blue Marbles.
A marble is taken from each bag in turn .
What is the probability of getting a blue marble followed by a red taking first ball from bag A and second from bag B?

A
514
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B
314
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C
814
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D
None of these
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Solution

The correct option is A 514
The probability of getting a blue marble from bag A is 43+4=47
And the probability of getting a red marble from bag B is 55+3=58
probability of getting a blue marble followed by a red becomes 47×58=514

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