A box contains two 50 paise coins, five ...

A box contains two 50 paise coins, five 25 paise coins and a certain fixed number `N(geq2)` of 10 and 5-paise coins. Five coins are taken out of the box at random. Find the probability that the total value of these 5 coins is less than 1 rupee and 50 paise.

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The correct Answer is:

`1 - (10 (n + 2))/( ""^(n + 7) C_(5))`

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