Can the sum of two mixed number be equal to 2 why?

Answer 1

Only if one of them is negative, eg:

31/2 + (-11/2) = 2

Otherwise both are positive and no:

A mixed number has a whole number greater than or equal to one plus a fractional bit, ie a mixed number is of the form 1a/b (1 and a fraction), 2a/b (2 and a fraction), 3a/b (3 and a fraction), etc

Adding two such numbers together must be at least:

(1 and a fraction) + (1 and a fraction) = 2 + (the sum of the fractions)

which must be greater than 2 and cannot equal 2 (as both the fraction are positive and their sum is greater than zero).