If $p_{01}$ is the index for current year 1 on the basis of the year 0 and $P_{10}$ is the index for the year 0 based on year 1 then time reverseall test satisfy :

$P_{01}×P_{10}=1$

The correct answer is Option (4) → $P_{01}×P_{10}=1$

The time reversal test is a test of consistency for index numbers, and ultimately ensures that if we reverse the time periods, the index calculations remain consistent.

$P_{01}×P_{10}=1$