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## Homework Statement

Calculate the error propagation for the theoretical effective spring constant for the two springs. The actual values don't matter, it's just supposed to show how it would be calculated.

## Homework Equations

ke=k1*k2/(k1+k2)

## The Attempt at a Solution

ke=A*B/(A+B) (Let A=k1, B=k2)

I have come up with two possibilities, but I'm not sure if either is correct. The addition in the denominator is confusing me.

Possibility 1: σ(ke)/|ke|=σ(A)/|A| + σ(B)/|B| + σ(A) +σ(B)

Possibility 2: σ(ke)/|ke|=σ(A)/|A| + σ(B)/|B| + (σ(A) +σ(B))/|A+B|