Obtain the expection of the number of tails preceding the first head in the indefinite series of tosses of the same coin

Let x denote the number of tails preceding the first head when an unbiased coin is tossed repeatedly find the probability distribution of x

A balanced coin is tossed repeatedly until a tail appears if x denotes the number of heads preceding the first tail find the probability distribution of x

Find the probability distribution of (i) number of heads in two tosses of a coin.  (ii) number of tails in the simultaneous tosses of three coins. (iii) number of heads in four tosses of a coin.

Find the probability of getting at least one tail in 4 tosses of a coin.

Find the mean number of heads in three tosses of a fair coin.

Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed 6 times. What are possible values of X?

Let X represent the difference between the number of heads and the number of tails obtained when an unbiased coin is tossed 7 times. Then, the possible values of X are -

The value of expection of the number of heads in 15 tosses of a coin is (15)/(k) . The value of K will be

If the number of heads obtained is denoted by x when two unbliased coins are tossed then find the mean value of X .

If the number of heads obtained is denoted by X when two unbiased coins are tossed then find the mean value of X.