A box contains 27 marbles some are blue and others are green If a marble is drawn at random from the...........

Quantitative Aptitude ( CCS) Probability

A box contains 27 marbles some are blue and others are green. If a marble is drawn at random from the box, the probability that it is blue is 1/3. Then how many number of green marbles in the box?

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Explanation:

Answer & Explanation
Answer – D. 18
Explanation :
Blue marble – x
^xC₁/²⁷C₁= 1/3
x/27=1/3 —> x=27/3=9
No of green marbles = Total – Blue marble =27-9=18