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Number System

Number System
Which one of the following represents the sum of the first n even numbers?

N(N – 1)
N2+ 1
N(N + 1)
N2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

N (N + 1)

Number System
7.98 x 3.75 + 1.28 x 15.5 = ?

48.765
49.765
46.765
47.765

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 29.925 + 19.84 = 49.765

Number System
ind the number, difference between number and its 3/5 is 50

120
125
124
123

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number = x,Then, x-(3/5)x = 50,=> (2/5)x = 50 => 2x = 50*5,=> x = 125

Number System
The sum of three consecutive numbers is 87. The greatest among these three number is:

28
29
26
30

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be x, x + 1 and x + 2 Then,x + (x + 1) + (x + 2) = 873x = 84x = 28Greatest number, (x + 2) = 30.

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 ?

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

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
How many numbers up to 100 are divisible by 7?

14
100
107
93

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

100/7 = 14 2/7 => 14 Numbers

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