7th Grade Challenging Math

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7-66)   Answer

          a) 1/5,     b) 2/5,    c) 3/5

Solution:

a) 3/6 x 2/5 = 1/5
b) 1/5 + 1/5 = 2/5
c) Assume he picks a red one first. The probability of him picking a blue one next is 3/5, since there are 3 blue marbles left of total of 5.