Which one of the following statements is incorrect? P (1) Direct and indirect methods are used f...

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Which one of the following statements is incorrect?
P
(1) Direct and indirect methods are used for the
W measurement of physical quantities.
(2) Scientific notation and the prefixes are used to simplify numerical computation.
(3) A dimensionally correct equation need not be a correct equation.
(4) The SI units is based on six base units.
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