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# If k = abc + 1, then prove that (k,a) = (k,b) = (k,c) = 1?

I have gotten this far, can anybody help me with the last few steps:

Suppose d divides k and d divides a, then k = du and a = dv

So du = k = abc + 1 = dvbc + 1

Therefore du = dvbc + 1......how do I show that d divides 1?

Update:

The parentheses imply greatest common divisor

### 1 Answer

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- fizixxLv 78 years agoFavorite Answer
I'm afraid I don't understand the notation.

What do the quantities in parentheses represent? ---- (k,a), (k,b) & (k,c)

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