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Update Python_Programming_Quiz.md

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`@@ -282,3 +282,24 @@ Function \| Description \|`
`282`	`282`	`# step 3 : [-8,5]`
`283`	`283`	`-13`
`284`	`284`	```
	`285`	`+`
	`286`	+#### 17. Differentiate between the `append()` and `extend()` methods of a list.
	`287`	`+`
	`288`	+`append()` __adds an element__ to the end of the list <br>
	`289`	+`extend` __adds another list__ to the end of a list.
	`290`	`+`
	`291`	+```
	`292`	`+>>> list1, list2 = [1, 2, 3], [5, 6, 7, 8]`
	`293`	`+`
	`294`	`+# This is how append() works:`
	`295`	`+`
	`296`	`+>>> list1.append(4)`
	`297`	`+>>> list1`
	`298`	`+[1, 2, 3, 4]`
	`299`	`+`
	`300`	`+And this is how extend() works:`
	`301`	`+`
	`302`	`+>>> list1.extend(list2)`
	`303`	`+>>> list1`
	`304`	`+[1, 2, 3, 4, 5, 6, 7, 8]`
	`305`	+```

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