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2. Photomath - Wikipedia

   en.wikipedia.org/wiki/Photomath

   Photomath is an educational technology mobile app, owned by Google. It features a computer algebra system with an augmented optical character recognition system, designed for use with a smartphone's camera to scan and recognize mathematical equations; the app then displays step-by-step explanations onscreen. [4]

3. Missing dollar riddle - Wikipedia

   en.wikipedia.org/wiki/Missing_dollar_riddle

   There seems to be a discrepancy, as there cannot be two answers ($29 and $30) to the math problem. On the one hand it is true that the $25 in the register, the $3 returned to the guests, and the $2 kept by the bellhop add up to $30, but on the other hand, the $27 paid by the guests and the $2 kept by the bellhop add up to only $29. Solution

4. Prefix sum - Wikipedia

   en.wikipedia.org/wiki/Prefix_sum

   Prefix sums are trivial to compute in sequential models of computation, by using the formula y i = y i − 1 + x i to compute each output value in sequence order. However, despite their ease of computation, prefix sums are a useful primitive in certain algorithms such as counting sort, and they form the basis of the scan higher-order function in functional programming languages.

5. What Is a Cognitive Test? - WebMD

   www.webmd.com/brain/what-is-a-cognitive-test

   All of the cognitive tests involve answering questions or performing tasks. They center around testing your memory, thinking processes, language, and your ability to identify things. The most ...

6. Tests and Exams for Dementia Diagnosis - WebMD

   www.webmd.com/alzheimers/diagnose-dementia

   MRI ( magnetic resonance imaging) scan: This uses powerful magnets and radio waves to make detailed images of your brain and the tissue and nerves around it. PET (positron emission tomography ...

7. Basic Math (video game) - Wikipedia

   en.wikipedia.org/wiki/Basic_Math_(video_game)

   Basic Math is an educational video game for the Atari Video Computer System (Atari VCS). [a] The game was developed at Atari, Inc. by Gary Palmer. The game involves a series of ten arithmetic problems involving addition, subtraction, multiplication, or division. The player can edit different gameplay modes to alter how the numbers in the ...