Number System When the square of a number is substracted from (68)², the answer so obtained is 2508. What is the number ? 44 47 45 46 44 47 45 46 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (68)² - x² = 2508Therefore, x² = 4624 = 2508Therefore, x = root of 2116 = 46
Number System A basket contains eight white and ten black balls. Two draws of one ball each are made without replacement. What is the probability that one ball is white and the other ball is black ? 80/151 80/150 80/153 80/152 80/151 80/150 80/153 80/152 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Two balls can be drawn from 18 balls in 18C2 Ways, ie 153 ways. One white from 8 white balls can be drawn in 8C1 = 8 ways and one black ball from 10 black can be drawn in 10C1 = 10 ways.∴ n(S) = 153, n(E) = 8 x 10 = 80∴ P(E) = 80/153
Number System If 5/7 of a number is 145, what is 180% of that number ? 365.4 355.4 375.4 345.4 365.4 355.4 375.4 345.4 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x x 5/7 = 145∴ x = 145 x 7/5 = 203Now, 203 x 180/100 = 365.4
Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 382 396 343 378 382 396 343 378 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System (12.11)2 + (?)2 = 732.2921 14.2 17.2 20.2 24.2 14.2 17.2 20.2 24.2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 24.2
Number System 3251 + 587 + 369 - ? = 3007 1375 1200 1250 1300 1375 1200 1250 1300 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let 4207 - x = 3007 Then, x = 4207 - 3007 = 1200
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