Find g. c. d. and l.c.m.. :
49, 42, 91
49 = 7 × 7
42 = 2 × 21 = 2 × 3 × 7
91 = 7 × 13
Therefore, g. c. d(49, 42, 91) = 7
l.c.m.(49, 42, 91) = 72 × 2 × 3 × 13
= 49 × 78 = 3822
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