Find the number of ways to p...
Find the number of ways to place three black pawns on a chessboard.Correct answers: 23
The first user who solved this task is Neelima Subrahmanyam.
#brainteasers #math
First U.S. commercial helicopter licenseIn 1946, the New York Journal-American newspaper was issued License No. 1 for its helicopter by the Cicil Aeronautics Administration. The helicopter was used for news gathering and delivering photographs. It was a Bell 47B, which had a cruising speed up to 100 m.p.h.« |