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If the value of Avogadro number is 6.023...

If the value of Avogadro number is `6.023 xx 10^23 "mol"^(-1)` and the value of Boltzmann constant is `1.380 xx 10^(-23) JK^(-1)`, then the number of significant digits in the calculated value of the universal gas constant is
[Hint: Since k and N, both have four significant figures, the value of R is also rounded off up to four significant figures.]

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