Calculate A-B+C*D
[6520] Calculate A-B+C*D - Look at the series (1, 5, A, 58, 179, 543, 1636, 4916, 14757, C, B, D, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A-B+C*D! - #brainteasers #math - Correct Answers: 31 - The first user who solved this task is Nasrin 24 T
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Calculate A-B+C*D

Look at the series (1, 5, A, 58, 179, 543, 1636, 4916, 14757, C, B, D, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A-B+C*D!
Correct answers: 31
The first user who solved this task is Nasrin 24 T.
#brainteasers #math
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An Elephant And Turtle

An elephant was drinking out of a river one day, when he spotted a turtle asleep on a log. So, he ambled on over and kicked it clear across the river.
"What did you do that for?" Asked a passing giraffe.
"Because I recognized it as the same turtle that took a nip out of my trunk 53 years ago."
"Wow, what a memory" commented the giraffe.
"Yes," said the elephant, "turtle recall".
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Snail extinction

In 1996, the last individual of the snail species Partula turgida (the Polynesian Tree Snail) died at the London Zoo. A protozoan disease of the digestive gland was believed responsible for the extinction of this last specimen. Numerous field surveys failed to find extant populations of this species in the wild (the South Pacific island of Raiatea in the Society Island chain, about 5000-km south of Hawaii). Raiatea residents began importing predatory snails from Florida in 1986 to eat a different pest snail, but the predators attacked the native snails. By 1991 they had driven the species to the brink of extinction. Scientists captured the last known P. turgida individuals to try to save them through captive breeding.«[Image: Polynesian tree snail of a different species in the Partula genus, shown on a test tube for scale]
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