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Number System

Number System
On converting the following base-2 numeral in base ten, 1101101, we get

106
108
109
107

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

109

Number System
If a number is subtracted from its square we get 272. Find the number?

14
22
24
17

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x2 – x = 272 => x =17

Number System
An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ?

89/190
91/190
90/190
92/190

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Total possible outcomes = 20C2 = 20 x 19/1 x 2 = 190Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91∴ Required probability = 91/190

Number System
Supply the missing figure : 1, 4, 9, 16, 25 .... 49

16
42
36
23

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

36

Number System
If the average of two numbers is 88.5 and one number is 5.5 less than the average. Find out the next number.

86
94
91
97

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

94

Number System
A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

31/58
32/51
34/55
37/52

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Probability of having no red ball is9C3 / 12C3 = 21/55Probability of having at least one red ball is 1 - 21/55 = 34/55

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