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4/9, 2/3, 1/6.

Factors of 9 = 3 * 3

Factors of 3 = 3

Factors of 6 = 3 * 2

At first find the common of all three numbers which is 3 and other two numbers 3 and 2 which are left.

Product of 3, 3 and 2 is 18

So Least common factor = 18.

So,

For the first fraction 4/9: 18/ 9= 2 and 2 * 4 = 8

For the second fraction 2/3: 18 / 3 = 6 and 6 * 2 = 12

Similarly for the third fraction: 1/ 6: 18 / 6= 3 and 3 * 1= 3

1 / 2 + 3 / 8 + 5 / 6.=(1 * 12 + 3 * 3 + 5 * 4) / 24

= (12 + 9 + 20) /24

= 41 / 24