A bag contains 19 unbiased coins and one coin with heads on both… | JEE Main 2025 Mathematics PYQ

MCQMediumJEE Main 2025 · 7 April, Shift 2Conditional Probability & Bayes Theorem

A bag contains $19$ unbiased coins and one coin with heads on both sides. One coin is drawn at random and tossed, and heads turns up. If the probability that the drawn coin was unbiased is $\frac{m}{n}$ , where $\gcd(m, n) = 1$ , then $n^2 - m^2$ is equal to:

A
$80$
B
$60$
C
$72$
D
$64$

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