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Decode a simplified barcode

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Perimeter of a semicircle

Given the diameter d, find the perimeter of a semicircle

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Given a square and a circle, please decide whether the square covers more area.

You know the side of a square and the diameter of a circle, please decide whether the square covers more area.

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Approximation of Pi

Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

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Pi Digit Probability

Assume that the next digit of pi constant is determined by the historical digit distribution. What is the probability of next di...

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radius of a spherical planet

You just measured its surface area, that is the input.

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Pi Estimate 1

Estimate Pi as described in the following link: <http://www.people.virginia.edu/~teh1m/cody/Pi_estimation1.pdf>

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Calculate area of sector

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Reverse Calculator

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Numbers in extended form

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Ripping numbers apart!

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Make a simplified barcode

Given an integer to encode, make a barcode using the following encoding scheme: * The bar code is made from the binary versio...

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7 segment LED display

Given a whole number, output how many segments would be lit up to display it on a 7 segment LED display (see Wikipedia: <http://...

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Convert Roman to Arabic Numerals

Based upon what I see on tv and at the movies, the use of Roman numerals indicates something is important or sophisticated (e.g....

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Math with Roman Numerals

Given a function R within (+,-,*,/) and two Roman numerals a & b, compute aRb in Roman numerals.

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Test if a Number is a Palindrome without using any String Operations

*Description* Given an integer _X_, determine if it is a palindrome number. That is, _X_ is equal to the _X_ with the digits ...

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