Find the G.C.F. & L.C.M. of 20 and 28.
Prime factorisation of 20, 28
20 = $$2\times\ 2\times5$$
28 = $$2\times\ 2\times7$$
G.C.F = $$2\times\ 2$$
L.C.M = $$2\times\ 2\times\ 5\times\ 7=140$$
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