Question

MDC (78,130,156) 
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Answer 1

D78={1, 2, 3, 6, 13, 26, 39, 78}
D130={1, 2, 5, 10, 13, 26, 65, 130}
D156={1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156}

mdc(78, 130, 156) = 26