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Pocket Coin ANS: First coin can be put in 3 ways, similarly second, third and fourth coins also can be put in 3 ways. So, 3*3*3*3. I m confused as: why not 4*4*4? 1st pocket can have 4 coins..??[confused]? please answer explaining basic concept of PnC. Thanks. If you are thinking in terms of pockets, it will complicate the matters. In case of coins, where you keep one coin will not affect where you keep the next coin. But if you think in terms pockets, how many coins you keep in one pocket, will affect how many coins can be put in other pockets. Let us see. Consider pocket A : In case of 0 coins, the second pocket can have 0 coins or 1 coin or 2 coins or 3 coins or 4 coins ... and then we have to think of third pocket also as sub cases.... In case of 1 coin, the second pocket can have 0 coins or 1 coin or 2 coins or 3 coins..... and then sub cases etc. Let us simplify: The possible arrangements of combinations are A B C No. of comibations
COINS not in YOUR pocket change!
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US $13.49








































































































