Which number is missing?
[34] Which number is missing? - Which number is missing? - #brainteasers #math #riddles - Correct Answers: 105 - The first user who solved this task is Djordje Timotijevic
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Which number is missing?

Which number is missing?
Correct answers: 105
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles
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A man and a woman had been mar...

A man and a woman had been married some time when the woman began to question her husband. "I know you've been with a lot of woman before. How many were there?"
The husband replied, "Look, I don't want to upset you, there were many. Let's just leave it alone."
The wife continued to beg and plead.
Finally, the husband gave in. "Let's see." he said "There was one, two, three, four, five, six, you, eight, nine..."
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Phototransistor

In 1950, the invention of the phototransistor was announced. This was a transistor operated by light rather than electric current, invented by Dr. John Northrup Shive of the Bell Telephone Laboratories at Murray Hill, N.J. It used a tiny chip of germanium, a semiconductor material, but only a single collector wire. The tip of this wire rests in a small dimple ground into one side of the germanium disk. At this point the germanium disk is only three thousandths of an inch thick. Light focussed on the opposite, un-dimpled side of the disk can control the flow of current in the wire, thus making a control device similar in function to a photo-electric cell.
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