An unbiased coin is tossed eight times. The probability of obtaining at least one head and at least one tail is :
← JEE Main 2017 · 8 Apr · Shift 1
MathematicsSingle correct+4 / -1Question 87 of 90
JEE Main 2017 · 8 Apr · Shift 1, Mathematics question 87
Answer and worked solution
Official answer: B
Exclude all heads and all tails: .
Topics:Classical probability