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so lets say i multiply y by 2, then it becomes 20

but does the uncertainty becomes 3 x 2 = 6? , hence y = 20±6 ?

what about divide? does it becomes 1.5?

i roughly understand fractional uncertainty and propagation of uncertainties, but what if i multiply the value of y with a constant as in the case above. what will become of the uncertainty?

thanks for help!