1 zepto is equal to
(A) 10-25
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(B) 1025
(C) 10-21
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(D) 10-22
(E) None of the above/ More than one of the above
Answer: (C)
A zepto is a unit prefix—like kilo, milli, and centi—in the metric system representing a factor of 10−21, or 0.000000000000000000001.
