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Question

Two cubes have their face painted as either red or blue color. 1st cube has 5 faces red and 1 face blue. The probabilty that both the faces show same color on rolling is 12. How many red faces are present on the 2nd cube.



A

6

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B

4

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C

3

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D

2

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Solution

The correct option is C

3


Suppose x faces of cube 2 is red then 6x will be blue.

P(RR or BB)= 56×x6+16×(6x)6=12

5x36+(6x)36=12

4x+6=18

x=3

Hence number of red faces is 3.


Mathematics

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