Question: ANSWER MUST BE IN PYTHON a) Write a python function, call it add_it_up (), that takes a single integer as input and returns the sum

ANSWER MUST BE IN PYTHON

a) Write a python function, call it add_it_up (), that takes a single integer as input and returns the sum of integers from 0 up that integer.

If a non-integer is passed, it should return 0.

b) show that the sum up to a specific n is equal to n(n+1)/2.

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