Q1 of 18 Page 73

Rajani has three necklaces and three pairs of earrings, of green, blue and red stones. In what all different ways can she wear them? What is the probability of her wearing the necklace and earrings of the same colour? Of different colours?

Let the necklace and earrings of different stone be denoted by G, B and R for green, blue and red stones respectively.


Now,


Make pairs of necklace and earring like (necklace, earing)


Pairs are:


(G, G), (B, G), (R, G)


(G, B), (B, B), (R, B)


(G, R), (B, R), (R, R)


Total number of pairs = 9


Pairs having the same colour = 3


Probability of having same colour necklace and earing




=


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