Initially, a standard deck of cards has 52 cards.
There are 13 cards of each suit: hearts, diamonds, clubs, and spades.
Hearts and diamonds are red, while clubs and spades are black.
So there are 26 red cards and 26 black cards.
We are given that 2 cards of hearts are missing and 4 cards of spades are missing.
The total number of missing cards is $2 + 4 = 6$.
The number of cards remaining is $52 - 6 = 46$.
Originally, there were 13 spades, but 4 are missing.
So the number of spades remaining is $13 - 4 = 9$.
Originally, there were 13 clubs, and no clubs are missing.
So the number of clubs is 13. The total number of black cards remaining is $9 + 13 = 22$.
The probability of getting a black card from the remaining pack is the number of black cards remaining divided by the total number of cards remaining: $$ P(\text{black card}) = \frac{\text{Number of black cards remaining}}{\text{Total number of cards remaining}} = \frac{22}{46}$$
The probability of hitting the target by a trained sniper is three times the probability of not hitting the target on a stormy day due to high wind speed. The sniper fired two shots on the target on a stormy day when wind speed was very high. Find the probability that
(i) target is hit.
(ii) at least one shot misses the target. 
Smoking increases the risk of lung problems. A study revealed that 170 in 1000 males who smoke develop lung complications, while 120 out of 1000 females who smoke develop lung related problems. In a colony, 50 people were found to be smokers of which 30 are males. A person is selected at random from these 50 people and tested for lung related problems. Based on the given information answer the following questions: 
(i) What is the probability that selected person is a female?
(ii) If a male person is selected, what is the probability that he will not be suffering from lung problems?
(iii)(a) A person selected at random is detected with lung complications. Find the probability that selected person is a female.
OR
(iii)(b) A person selected at random is not having lung problems. Find the probability that the person is a male.