Answered

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2. A box contains balls numbered 1 to 20. Marina picks a number randomly, seen and noted the number, then she returned thenumber in the box. Then, she picks another number from the box, what is the probability that the two numbers are multiples of5?​.

Sagot :

(1,2,3,4,5,...,20)
(5,10,15,20) and (5,10,15,20)
({5,5}, {5,10}, {5,15}, {5,20}, {10,10}, {10,15}, {10,20}, {10,5}, {15,5}, {15,15}, {15,10}, {15,20}, {20,20}, {20,5}, {20,10}, {20,15})

Answer = 12