Question

Two urns urn a has 3 distinct red balls and urn has 9 distinct blue balls

Answer 1

Total no. of balls in urn A=3

Total no. of balls in urn B=9

The number of ways in which two balls from urn A and two balls from urn B can be selected =3C2×9C2

3C2=3/21=3

9C2=9/2×7=9×8×7/2×7=36

3C2×9C2=3×36

⇒108

Answer 2

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