CTET 2 Math and Science Feb 2015 Paper

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Question : 43 of 120

Marks: +1, -0

In standard form, 0.00001278 is expressed as

k × 10^n

. The value of (k + n) is

– 3.278
3.278
– 3.722
4.722

Solution:

0.00001278=k×10^{n}

⇒1.278×10^{-5}=k×10^{n}

Now,

k=1.278,n=-5

So,

k+n=1.278-5

=-3.722

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