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A bag contains (2n+1) coins. It is known that (n -1) of these coins have a head on both sides, whereas the rest of the coins are fair. A coin is picked up at random from the bag and is tossed. If the probability that the toss results in a head is 31/42, determine the value of n.

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No. of coins with head on both sides = (n-1)

No. of fair coins = (n+2)

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