अच्छी तरह से फेंटी गई 52 ताश की गड्डी में से दो पत्ते यादृच्छिक रूप से निकाले जाते हैं। इसकी क्या प्रायिकता है कि उन दो पत्तों में से एक पत्ता लाल और दूसरा पत्ता काला हो?

A box contains 'x + 4' red, 'x – 1' green and 'x – 5' blue balls. If two balls are drawn from the bag one after another without replacement, then the probability of getting one red and one green ball is equal to the probability of getting a sum equal to or more than 8 when two fair dice are rolled. Find the probability of drawing a red ball when one ball is drawn at random from the bag.

Four persons are chosen at random from a group containing 3 men, 2 women, and 4 children. The probability that exactly two of them are children is: