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Number System

Number System
Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number?

N(N + 1)/2
N2
N(N + 1)
N2 + 1

ANSWER DOWNLOAD EXAMIANS APP

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 ?

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

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
If the difference between a number and two-fifths of that number is 45 what is the number ?

77
78
75
76

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x ∴ x - 2x/5 = 45∴ x = 75

Number System
Ratio between two numbers is 3: 4 and their sum is 420. Find the smaller number?

240
180
140
160

ANSWER DOWNLOAD EXAMIANS APP

Number System
In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient?

12
13
20
0

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Number = (12 * 35) = 420Correct quotient = 420/21 = 20

Number System
Find the least number with which 16200 should be multiplied, to make it a perfect cube.

48
45
360
36

ANSWER DOWNLOAD EXAMIANS APP
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