Question
Two balls are drawn randomly without replacement from a bag
containing 7 red balls and 5 green balls. What is the probability that both balls are green?Solution
Total balls = 12
Green balls = 5
Required probability = (5C2) / (12C2) = 10 / 66 = 5/33
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If  a 2 + b 2 + c 2 = 40 & ab + bc + ca = 12 then a + b+ c = ?
