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What is the next number in this series?

Look at the series (0.5, 2, 4.5, 8, 12.5, ?), determine the pattern, and find the value of the next number!

Correct answers: 85

The first user who solved this task is Manguexa Wagle.

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William Edward Ayrton

Born 14 Sep 1847; died 8 Nov 1908 at age 61. English physicist and inventor who was a pioneer in technical education. He collaborated with John Perry, and their numerous inventions include an electric tricycle (1882), the first practical portable ammeter, voltmeter and other instruments for electrical measurement. Earlier in his career, he had spent five years with the Indian Telegraph Service during which time he developed techniques for fault detection in order to maintain the telegraph system.«

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