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Prachi’s Coins
Find Out How many coins were there initially in the piggy bank?
Prachi’s piggy bank contained a number of coins of belonging to different currencies, with equal number of coins of each currency. When her mom returned from a trip to Dubai, she gave Prachi 20 more coins to add to her collection. Prachi was ecstatic as she didn’t have any coins from Dubai priorly. She immediately added the coins to here piggy bank. Later on when she proudly showed her collection to her friend, Florisa, Prachi realised that adding the 20 new coins did not alter the probability of drawing (without replacement) two coins of the same currency. How many coins were there initially in the piggy bank?
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