17.
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The greatest common factor (GCF) of 34, 51, and 68 is 17. To find the GCF, you need to determine the factors of each number and then identify the largest factor that is common to all three numbers. In this case, the factors of 34 are 1, 2, 17, and 34; the factors of 51 are 1, 3, 17, and 51; and the factors of 68 are 1, 2, 4, 17, 34, and 68. The largest factor that is common to all three numbers is 17, making it the GCF.
51
3 x 34 = 102
3 can go into 102 34 times. This is because 3 multiplied by 34 equals 102. In mathematical terms, this can be expressed as 102 ÷ 3 = 34.
The GCF of any set of numbers implies that all numbers in the set are multiples of the GCF. The multiples of 17 are 17,34,51 etc. If the greater number is 51 (which is an odd number) then the only solution for the other number (which is even and less than 51) is 34.