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One hundredth of centimetre when written in fractions of kilometres is...

This question belongs to Arithmetic Ability Decimal Fraction
Decimal Fraction
?

One hundredth of centimetre when written in fractions of kilometres, is equal to :

Answer & Solution
Correct Answer: Option A
Required fraction :
$$\eqalign{ & = \frac{{\frac{1}{{100}}{\text{ cm}}}}{{1{\text{ km}}}} \cr & = \frac{{\left( {\frac{1}{{100}}} \right){\text{ cm}}}}{{\left( {1000 \times 100} \right){\text{ cm}}}} \cr & = \frac{1}{{100 \times 1000 \times 100}} \cr & = \frac{1}{{10000000}} \cr & = 0.0000001 \cr} $$
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