JEE Main & Advanced
Mathematics
Question Bank
Critical Thinking
question_answer
A purse contains 4 copper coins and 3 silver coins, the second purse contains 6 copper coins and 2 silver coins. If a coin is drawn out of any purse, then the probability that it is a copper coin is [BIT Ranchi 1991; MNR 1984; UPSEAT 2000]
A) 4/7
B) 3/4
C) 37/56
D) None of these
Correct Answer:
C
Solution :
Required probability \[=\frac{1}{2}.\frac{4}{7}+\frac{1}{2}.\frac{6}{8}=\frac{37}{56}.\]