Geometry : John has 3 unique coins such that the probability of obtaining a head when the coin is flipped is 110 , 210 and 310 , respectively . If he flips each of the 3 coins once , the probability that at least 1 heads appears is p . What is the value of 1000p ?
I have n fair coins and toss them all up together . Let the number of heads I get be X. My friend , Bob has -LRB- n + k -RRB- fair coins and he tosses them together too to get Y number of heads . What is probability that P -LRB- X > Y -RRB- ?