Question

A pack of cards is counted with face downwards. It is found that one card is missing. One card is drawn and is found to be red. Then the ability that the missing card is red.

• A. $\frac{25}{51}$
• B. $\frac{26}{51}$
• C. $\frac{1}{2}$
• D. $\frac{25}{52}$

Answer 1

The correct option is A $\frac{25}{51}$

There are a total of 52 cards out of which 26 are black & 26 are red.

One card is drawn and turns out to be red. So we have 25 red cards in the remaining pack of 51 cards

$\therefore$ required probability $=\frac{25}{51}$