An infinite number of of multiples of 42 can be divided by 42.
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Any of its factors which are: 1, 2, 17 and 34
Only the number 1.
The only number is 7. 7x5=35 7x7=49
Because 210 is the smallest number that both 30 and 42 divide into equally with no remainder.
The HCF of the given four numbers is 1