Triangular matrix If U1, U2 are upper triangular and L1, L2 are lower triangular, which of the following are triangular? U1 + U2 U1U2 U12 U1 + L1 U1L1 L1 +...
The sunrise problem Two women start walking at the sunrise, one from point A to B and another from point B to A. The pass each other exactly at noon. The first...
Calculate A+B+C+D Find (A + B + C + D) such that AB x CB = DDD, where AB and CB are 2-digit numbers and DDD is a 3-digit number. ...
Puzzle Can you solve in 1 minute?? Can you solve in 50 seconds? can you solve in 30 seconds? can you solve in 10 seconds? Mention the time that you...
Faster runner, slower runner Two runners start on a straight one-mile race track. The slower runner S is given a handicap and starts first. The faster runner F then starts and after 4...
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