Solution
H.C.F. (a,b) $$\times$$ L.C.M. (a,b) = $$a \times b$$
The numbers a = 63 and b = 77 and HCF = 7
=> L.C.M. = $$\frac{a \times b}{HCF}$$
= $$\frac{63 \times 77}{7} = 63 \times 11$$
= 693
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