find the sum of all 2 digit number divisible by 7
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am taking the term 'two digit number' to mean a positive integer that can be fully defined by two decimal digits, and also needs two digits to be fully defined. So 17 is a two digit number. 07 isn't because it can be and normally is written as one digit, 7.
So 'two digit numbers' by this definition are integers in the range [10..99]
The multiples of 7 in this range are those from 14 to 98, 2*7 to 14*7.
The number of such multiples, two digit numbers divisible by 7, is 13.
If you want to include negative numbers in your definition, the answer is 26.
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