Question

A={x belongs N:x is a multiple of 3} and B={x belongs N :x is a multiple of 6} then (A-B)=?

Answer 1

x is a multiple of 3 but till when?? like 3*1, 3*2, 3*3, ......

Answer 2

Solution b:

A = { x/x is a multiple of 3 , x€N }

= { 3,6,9,12,15,18,21,... }

B = { 6,12,18,24,30,36,.....}

A - B = { 3,6,9,12,15,...} - {6,12,18,24,..}

= { 3,9,12,15,... }

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