Question 34

Find the G.C.F. & L.C.M. of 20 and 28.

Solution

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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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