Is getting a head complementary to getting a tail ? Give reasons.

In case of a die is getting a 1 complementary to events getting 2, 3,4, 5,6 ? Give reasons for your answer.

Getting a tail or head…………

A coin is biased such that the probability of getting head is thrice to that of getting a tail. If such coin is tossed twice find the probability of getting one head exactly.

A fair coin is tossed a fixed number times . If the probability of getting seven heads is equal to that of getting nine heads then the probability of getting two heads is

When a coin is tossed the probability of getting a tail or head is…….

Suppose that a coin is tossed three times. Let A be "getting three heads" and B be the event of "getting a head on the first toss".Show that A and B are dependent events.

Two coins are tossed . The probability of getting 2 tails if it is known that there is atleast one tail on the coins is

A coin is tossed 20 times. Find the probability of getting atleast 12 consecutive heads.

A fair coin is tossed a fixed number of times. If the probability of getting five heads is equal to that of getting seven heads, then the probability of getting four heads is