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What is the number of significant figure...

What is the number of significant figures in Avogadro's number `(6.0 xx 10^(23))` and Planck's constant `(6.62 xx 10^(-34) J s)`.

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Avogadro's number `(6.0 xx 10^(23))` has 2 significant figures while Planck's constant `(6.60 xx 10^(-34) Js)` has three significant figures since only significant figures of 6.0 and 6.62 are considered.
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