"If Owens joined the firm in 1965 and MacNeil joined it in 1967, one can determine the years in which exactly how many of the other partners joined the firm?"
We know that
H - -N - O
K - J - M
N and J are both before G and G is before I
I has all of the remaining pieces before it, so we know I has to go last in 1968. Additionally, G has all of the remaining pieces before it except for I, so G must go in 1966. The other pieces could move around some, so we know that we can determine the spots of 2 of the other partners, I and G. Thus, (B) is the correct answer choice.
_ _ _ _ O G M I
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