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Under the action of load F1, the length of a string is L1 and that under F2, is L2. the original length of the wire is
(a) [L1F1 - L2F2] / [F1 + F2]
(b) [L1F2 - L2F1] / [F1 - F2]
(c) [L1F2 - L2F1] / [F2 - F1]
(d) [L1F2 - L2F1] / [F1 + F2]
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