Tag: general knowledge

The Great Wall of China was built to protect against northern invasions including the Huns. The Forbidden City was a palace, not defensive. Xin Nian Jie is Chinese New Year, not a structure.

Ancient Chinese rulers were called Emperors and Empresses. China did not have kings and queens, prime ministers, or presidents in imperial times.

The abacus is the traditional calculation tool used in China (and other Asian countries). A rickshaw is transport, a wok is cooking equipment, and Chinese Calculator is not the traditional tool's name.

The Great Wall of China was primarily built to defend against northern nomadic tribes, particularly the Xiongnu (often associated with the Huns). While various groups including the Mongols later breached the Wall, the Huns were one of the earliest and most significant threats that prompted its construction and expansion.

Use inclusion-exclusion: P(both red) + P(both kings) - P(both red kings). P(both red) = 26C2/52C2 = 325/1326. P(both kings) = 4C2/52C2 = 6/1326. P(both red kings) = 2C2/52C2 = 1/1326. Total = (325+6-1)/1326 = 330/1326 = 55/221.

Use the complement: P(at least 1 defective) = 1 - P(no defective) = 1 - P(both good). P(both good) = (16/20) * (15/19) = 240/380 = 12/19. So P(at least 1 defective) = 1 - 12/19 = 7/19.

A standard deck has 4 tens and 13 spades. The ten of spades is in both categories, so we count it once. Total favorable cards = 4 + 13 - 1 = 16. Probability = 16/52 = 4/13.

Total balls = 6 + 8 = 14. White balls = 8. Probability of drawing white = 8/14 = 4/7.

India has one of the world's largest railway networks, but China currently has the largest railway system by route length. India ranks among the top 4 globally.