Question

3 coins are tossed simultaneously what is the probability of gettind (1) at the least 2 heads (2) at the mist 2 heads (3) exactly 2 heads​

Answer 1

when three coins are tossed, the number of total outcome would be 2x2x2 = 8

(HHH),(HHT)(HTH)(THH)(HTT)(THT)(TTH)(TTT)

1) atleast two heads-- means two heads or more

as we can see in four out of above eight outcomes we will get atleast two heads

(HHH)(HHT)(HTH)(THH)

so the probability is 4/8 = 1/2

2) atmost two heads-- means two heads or less

as we can see except (HHH), all outcomes have two heads or less

so probability = 7/8

3) exactly two heads

in three outcomes, there are exactly two heads

so probability is = 3/8