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Number System

Number System
What is the difference between the largest number and the least number written with the digits 7, 3, 1, 4?

6184
5084
6048
6084

ANSWER DOWNLOAD EXAMIANS APP

Number System
56.21 +2.36+5.41 —21.4+1.5=?

54.08
64.08
44.08
34.08

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

44.08

Number System
How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers?

1192
1082
1092
1200

ANSWER DOWNLOAD EXAMIANS APP

Number System
If x + y = 61 and xy = 888, What is the value of x²+ y² ?

1955
1975
1965
1945

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Because (x + y)²  = x² + y² + 2xy∴ x² + y² = (x + y)² - 2xy∴ x² + y² = (61)² - 2 x 888= 3721 - 1776 = 1945

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

N(N – 1)
N(N + 1)
N2+ 1
N2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

N (N + 1)

Number System
When (21)² is subtracted from the square of a number the answer obtained is 1584. What is the number ?

65
35
55
45

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.According to the question,x² - (21)² = 1584= x² - 441 = 1584 = x² = 1584 + 441 = 2025∴ x = √2025 = 45

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