Question # 1

A bag contains 7 whit, 5 black and 4 rd balls. If two balls are drawn at random from the bag, the probability that they are not of the same color is

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73 / 120

83 / 120

67 / 120

43 / 120

In a country, 55% of the male population has houses in cities while 30% have houses both in cities and in village. Find the percentage of the population that has house only in villages.

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45

30

25

50

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I and III quadrants

II and III quadrants

I and II quadrants

II and IV quadrants

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none of these

If A and B are skew-symmetric then (AB)t is

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At Bt

AB

-AB

BA

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An ellipse

A parabola

A circle

A hyperbola

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1

0

3

-3

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1.5

1.2

8

None of these

The multiplicative inverse of 1 is

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1

-1

0

Does not exist

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30°

45°

60°

120°

The approximate increase in the area of a circular disc if its diameter increased form 44cm to 44.4cm is

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0.4cm

8.8πcm

17.6 πcm

35.2πcm

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