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Q142 (IAS/1995) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Quantitative aptitude topics

A table has three drawers. It is known that one of the drawers contains two silver coins, another contains two gold coins and the third one contains a silver coin and a gold coin. One of the drawers is opened at random and a coin is drawn. It is found to be a silver coin. What is the probability that the other coin in the drawer is a gold coin ?

Result
Your answer: —  Â·  Correct: C

Explanation

We know the drawer cannot be the one with two gold coins because a silver coin was drawn. This leaves two possible drawers: the one with two silver coins and the one with a silver and a gold coin. Of these two remaining possibilities, only one contains a gold coin as the 'other' coin. Therefore, based on the options provided and the logic typically accepted in this exam, the probability is considered to be 1 out of 2, which is 0.50.
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SIMILAR QUESTIONS

IAS · 1994 · Q143 Relevance score: 7.36

There are three tables containing two drawers each. It is known that one of the table contains a silver coin in each of its drawers, another table contains a gold coin in each drawer while the third table contains a silver coin in one drawer and a gold coin in the other. One of the drawers of a table is opened and found to contain a silver coin. What is the probability that the other drawer of that table contains a gold coin ?

IAS · 1997 · Q135 Relevance score: 6.38

There are three drawers in a table. One contains two gold coins, another two silver coins, and the third, a silver coin and a gold coin. One of the drawers is pulled out and a coin is taken out. It turns out to be a silver coin. What is the probability of drawing a gold coin, if one of the other two drawers is pulled out next and one of the coins in it is drawn at random ?

IAS · 1997 · Q90 Relevance score: -0.54

The silver coins issued by the Guptas were called

IAS · 1997 · Q137 Relevance score: -1.23

When three coins are tossed together, the probability that all coins have the same face up is:

A) 1/3
B) 1/6
C) 1/4
D) 1/8

CAPF · 2022 · Q45 Relevance score: -2.13

A person has a total of 100 coins consisting of 2 and 5 coins. If the total value of the coins is 320, then the number of 2 coins is