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 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 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 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 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 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 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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