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Humus: A complex and rather resistant mixture of brown or black amorphous and colloidal substances modified from the original tissues or synthesized by the various soil organisms.
Simplify
What is the value of 1² + 3² + 5² + 7² + 9² ................ 19²?
Find the number of zeroes in the end of 100!
Find the highest common divisor of 1080, 2700, and 6480.
What least number must be added to 6834 to get a number exactly divisible by 18?