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24|2 36|2 42|2
12|2 18|2 21|3
6|2 9|3 7|7
3|3 3|3 1|
1| 1|
48=2^4x3 72= 2^3x3^2 84=2^2x3x7
M.C.D= 2^2x3
=4x3
=12