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A physical parameter a can be determined...

A physical parameter `a` can be determined by measuring the parameters `b,c,d` and `e` using the relation `a = b^alpha c^beta //d^gamma e^delta`. If the maximum errors in the measurement of ` b, c, d` and `e ` are `b_1 %`, `c_1 %`, `d_1 %` and `e_1 %` then the maximum error in the value of `a ` determined by the experiment is
`(b_1+c_1+d_1+e_1)%`
` (b_1+c_1-d_1-e_1)%`
`(alphab_1+betac_1-gammad_1-deltae_1)%`
`(alphab_1+betac_1+gammad_1+deltae_1)%`

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