Sum of numbers in an interval (2) X39837

Statement

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Write a funcion sum_interval(a, b, n) that receives two integers a,b such that 0≤a≤b, and a natural 0≤n≤9, and returns the sum of all integers in [a,b] whose last digit is n.

Sample session

>>> sum_interval(5,10,8)
8
>>> sum_interval(5,10,3)
0
>>> sum_interval(1,100,6)
510
>>> sum_interval(10,20,0)
30

Information

Author: ProAl
Language: English
Official solutions: Python
User solutions: Python