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tmua.me Extreme Set B Paper 1 · Q2

Paper 1Algebra

Two positive integers aa and bb, with a<ba<b, satisfy

a+b=120.a+b=120.

The sum of their highest common factor and their lowest common multiple is 360360.

What is the sum of all the distinct possible values of b−ab-a?

A7676
B2020
C4040
D5656
E6060
F152152

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