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A Bag Contains Twenty Rs 5 Coins, Fifty Rs 2 Coins and Thirty Re 1 Coins. If It is Equally Likely that One of the Coins Will Fall Down When the Bag is Turned Upside Down, What is the Probability that the Coin: Will Not Be a Rs 2 Coin? - ICSE Class 10 - Mathematics

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Question

A bag contains twenty Rs 5 coins, fifty Rs 2 coins and thirty Re 1 coins. If it is equally likely that one of the coins will fall down when the bag is turned upside down, what is the probability that the coin: 

will not be a Rs 2 coin? 

Solution

Total number of coins=20+50+30=100 

Total possible outcomes=100=n(s) 

Number of favorable outcomes for not a Rs 1  or Rs 5 coins=30+20+50=n(E) 

Probability (not Rs 2 coin) =`(n(E))/(n(S))=50/100=1/2 `

  Is there an error in this question or solution?
Solution A Bag Contains Twenty Rs 5 Coins, Fifty Rs 2 Coins and Thirty Re 1 Coins. If It is Equally Likely that One of the Coins Will Fall Down When the Bag is Turned Upside Down, What is the Probability that the Coin: Will Not Be a Rs 2 Coin? Concept: Probability - A Theoretical Approach.
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