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a+b+c=30 ;then a=?;b=?;c=? by using 1,3,5,7,9,11,113,15 u can repeat the numbers also

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UPSC Other Question

____+____+____=30
fill the blanks with any of these following numbers.
(1,3,5,7,9,11,13,15)
u can repeat the numbers..
A bag contains 20 balls. 8 balls are green, 7 are white and 5 are red. What is the minimum number of balls that must be picked up from the bag blind-folded (without replacing any of it) to be assured of picking atleast one ball of each colour?