In the problem 1/3 + 1/3, the denominators (3) are the same in both fractions so simply ADD the numerators (1 +1 ) and KEEP the denominators the same.. Hashcodes do not reliably tell you if two objects are equal; there is always a chance of hash collision.. The built-in Equals function of Dictionary only checks for reference equality, see this question on SO.
Never use hashcodes as an equality test!. Equal definition, as great as; the same as (often followed by to or with): The velocity of sound is not equal to that of light.. The answer is 2/3 The rule when adding fractions is the denominator must be the same.
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