Question

4 coins are tossed on parallel.what is the probability of getting at least one head

Answer 1

Each coin can result in Head (H) or Tail (T).

4 coins are tossed so total number of possible outcomes are 2^4= 16 which as as shown below

At least one head means 1 or more head.

From table we see that there are 15 cases where we are getting at least one head.

Total possible outcomes are 16 as calculated in beginning.

Hence required probability is 15/16.