Calculate A+B+C+D
[6356] Calculate A+B+C+D - Look at the series (10, C, B, 59, A, 227, 451, 899, 1795, 3587, D, 14339, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A+B+C+D! - #brainteasers #math - Correct Answers: 42 - The first user who solved this task is Nasrin 24 T
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Calculate A+B+C+D

Look at the series (10, C, B, 59, A, 227, 451, 899, 1795, 3587, D, 14339, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A+B+C+D!
Correct answers: 42
The first user who solved this task is Nasrin 24 T.
#brainteasers #math
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A family was visiting an Indian reservation when they happened upon an old tribesman lying face down in the middle of the road with his ear pressed firmly against the blacktop.

The father of the family asked the old tribeman what he was doing. The tribesman began to speak..."woman, late thirties, three kids, one barking dog in late model, white, four-door station wagon, traveling at 65 m.p.h.

"That's amazing!" exclaimed the father. "You can tell all that just by listening to the ground?"

"No," said the old tribesman, weakly. "They just ran over me five minutes ago!"

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John Landen

Died 15 Jan 1790 at age 70 (born 23 Jan 1719).British mathematician who made important contributions on elliptic integrals. As a trained surveyor and land agent (1762-88), Landen's interest in mathematics was for leisure. He sent his results on making the differential calculus into a purely algebraic theory to the Royal Society, and also wrote on dynamics, and summation of series. Landen devised an important transformation, known by his name, giving a relation between elliptic functions which expresses a hyperbolic arc in terms of two elliptic ones. He also solved the problem of the spinning top and explained Newton's error in calculating the precession. Landen was elected a Fellow of the Royal Society in 1766. He corrected Stewart's result on the Sun-Earth distance (1771).
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