Calculate A*B-C-D
[6373] Calculate A*B-C-D - Look at the series (7, 4, 5, 12, 45, D, 1329, 9300, 74397, C, B, A, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A*B-C-D! - #brainteasers #math - Correct Answers: 19 - The first user who solved this task is Nílton Corrêa de Sousa
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Calculate A*B-C-D

Look at the series (7, 4, 5, 12, 45, D, 1329, 9300, 74397, C, B, A, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A*B-C-D!
Correct answers: 19
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math
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Looking Heavenward

The temporary Sunday School teacher was struggling to open a combination lock on the supply cabinet. She had been told the combination, but couldn't quite remember it. She went to the pastor's study and asked for help. The pastor came into the room and began to turn the dial. After the first two numbers he paused and stared blankly for a moment.Finally he looked serenely heavenward and his lips moved silently. Then he looked back at the lock, and quickly turned to the final number, and opened the lock. The teacher was amazed. "I'm in awe at your faith, pastor," she said. "It's really nothing," he answered. "The number is on a piece of tape on the ceiling."
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Electric street car

In 1880, Stephen D. Field of New York City was issued a U.S. patent for "propelling railway cars by electromagnetism" (No. 229,991). When he first used it on a street car in an electric street car in 1874, his inntion was the first electric streetcar to run successfully with current generated by a stationary dynamo. The current was conveyed by one of the rails, via a metal wheel to the onboard motor, and returned through a second metal wheel to the other rail. Field first filed for a caveat on 21 May 1879, and when issued, the patent protected his claim for this system of supplying electric power through the rails and to the motor.
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