Mathematics Puzzles

Puzzle :Rational choice assumption illustration: 100 gold coins & 5 pirates puzzle

ISI 2018 Party puzzle: In a party of 20 people, how many know everyone?

CMI 2019 A7 (Puzzle): Least number of keystrokes on a faulty calculator to get 260

Catenary: Amazon interview question [Updated]: Find the distance between the poles

ISI 2018 Clock puzzle: Difference in minutes when hour & minute hand are perpendicular in an hour

ISI 2018 Cube puzzle: n unit cube form a rectangular block, if invisible cubes are 30, find min n?

Mathematical Puzzle: ISI 2018 Arithmetic progression related work hour problem

Ramanujan's Challenge to Indian Mathematical society: Infinite nested radicals [Method 2 and 3]

Math Marvels: King's 1000 bottle of Wine puzzle Method 2

Ramanujan's Challenge to Indian Mathematical society: Infinite nested radicals [Method 1]

Math Marvels: King's 1000 bottle of Wine puzzle Method 1

(Express): Find the number of ways in which we can paint 6 faces of a cube with 6 different colors?

CMI 2018 B6: Puzzle: Find bounce number for a moving striker on a carrom board?

JEE Delight: IPMAT Q18: In the sequence 12345678910111213.. find 6389th digit?

IPMAT Q49: Sum of areas of three cubes with integer lengths is 564, find sum of their volumes?