Answer 1

In Python, dictionary keys must all be unique with one another.

Here the dict1 and dict2 merge or concatenate.

Now the dictionary will look like this:

dict3 = {'Ten': 10, 'Twenty': 20, 'Thirty': 30, 'Thirty': 30, 'Fourty': 40, 'Fifty': 50}

But since dictionary keys must be unique, the first "Thirty" key (which is not a unique key), should be removed.

Therefore, the dict3 will look now like this:
dict3 = {'Ten': 10, 'Twenty': 20, 'Thirty': 30, 'Fourty': 40, 'Fifty': 50}

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Try this and the value of 'Thirty' would be 25 because it gets the last or the last declared similar key.

dict3 = {'Ten': 10, 'Twenty': 20, 'Thirty': 30, 'Thirty': 25, 'Fourty': 40, 'Fifty': 50}

duct3 = {'Ten': 10, 'Twenty': 20, 'Thirty': 25, 'Fourty': 40, 'Fifty': 50}