quantitative aptitude test 48

Test # 48

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1.
The expression (1 - 1 / 3) (1 - 1 / 4) (1 - 1 / 5)(1 - 1 / m) when simplified yields :

Quantitative Aptitude
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keep one`s wits about one
to stay calm when there is trouble or danger
There was a fire in the building but the security guard was able to keep his wits about him and help everybody to safety.
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Basic English Usage
Misuse of one and parts of one with the singular

Don't Say:
I read it in one and a half hour.

Say:
I read it in one and a half hours.

Note:
In English, use the plural with anything greater than one, even it it's less than two.
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