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how many of the numbers below have 5 significant figures? 0.0054, 19.000, 0.00006, 1.6090 x 10^8,...

how many of the numbers below have 5 significant figures? 0.0054, 19.000, 0.00006, 1.6090 x 10^8, 13607.... my answer is 3 ...please explain

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