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Create 10_reduce().MD

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	`1`	+# `reduce()`
	`2`	`+`
	`3`	`+Apply a function to an iterable and reduce it to a single cumulative value. Perform function on first 2 elements and repeat process until 1 value remains.`
	`4`	`+`
	`5`	+Syntax: `reduce(function, iterables)`
	`6`	`+`
	`7`	+```py
	`8`	`+import functools`
	`9`	`+letters = ['H', 'E', 'L', 'L', 'O']`
	`10`	`+word = functools.reduce(lambda x,y: x+y, letters)`
	`11`	`+print(word)`
	`12`	`+factorial = [5,4,3,2,1]`
	`13`	`+result = functools.reduce(labmda x,y: x*y, factorial)`
	`14`	`+print(factorial)`
	`15`	+```

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