mathematics
posted by amartya .
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?

the probability of any event is a number p such that
0 ≤ p ≤ 1
Your data makes no sense. 
she meant
1/10 and 2/10 3/10 
answer ?