A bag contains `(2n+1)`
coins. It is known that `n`
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`
.
A. 10
B. 11
C. 12
D. 13
