I realize this question is pretty basic, but here goes.

Imagine I am playing "Jacks or Better" and I draw the following. Don't worry about the suits - this question isn't about flushes.

K 7 7 4 2

Obviously, I am going to dump the 4 and the 2. What do I keep - K? Both 7s? K and both 7s?

I have always kept the low pair (the 7s in my example), but should also hedge my bet and keep that King for the chance of breaking even on two Kings?