Pick up the correct statement from the following :

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Question:Pick up the correct statement from the following :

1.the apparent error on reversal is twice the actual error

2. the correction may be made equal to half the observed discrepancy.

3.the good results may be obtained from a defective instrument by reversing and taking the mean of two erroneous results

4.all the above.

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  1. Pick up the correct statement from the following :
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