JEE Main 2021 · MathsMultiple choiceSingle correctEasyCalculation

JEE Main 26 February 2021, Shift 1, Maths Q75

Question 75 of 90 in this shift, Maths question 15 of 30, Section A.

A fair coin is tossed a fixed number of times. If the probability of getting 7 heads is equal to probability of getting 9 heads, then the probability of getting 2 heads is :

(1) $\frac{15}{2^8}$
(2) $\frac{15}{2^{12}}$
(3) $\frac{15}{2^{13}}$ Official answer
(4) $\frac{15}{2^{14}}$

Official answer

Option 3

NTA final key.

Chapter: Probability
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy