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If a quantity Q is dependent on three other quantities $$q_1, q_2 and q_3$$ related such that $$Q = K \times (q_1)^{n_1} \times (q_0)^{n_2} \times (q_3)^{n_3}$$ then overall error $$\frac {\delta Q}{Q} = $$
$$n_1 \left( \frac{\delta q_1}{q_1} \right) + n_2 \left( \frac{\delta q_2}{q_2} \right) + n_3 \left( \frac{\delta q_3}{q_3} \right) $$
$$\frac{1}{n_1} \frac {\delta q_1}{q_1} + \frac{1}{n_2} \frac {\delta q_2}{q_2} + \frac{1}{n_3} \frac {\delta q_3}{q_3} $$
$$ \frac {\delta q_1}{q_1} + \frac {\delta q_2}{q_2} + \frac {\delta q_3}{q_3} $$
$$\left( \frac {\delta q_1}{q_1} \right)^{n_1} + \left( \frac {\delta q_2}{q_2} \right)^{n_2} + \left( \frac {\delta q_3}{q_3} \right)^{n_3} $$
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