Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 396 378 343 382 396 378 343 382 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System The product of two consecutive odd numbers is 4623. What is the product of the next two consecutive odd numbers ? 7745 8795 5183 6782 7745 8795 5183 6782 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP √4623 = 6767 x 69 = 4623∴ Required product = 71 x 73 = 5183
Number System Let R = qs—4. When s=8, R=16. When s=10, R is equal to 21 23 20 22 21 23 20 22 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 21
Number System Which is the smallest fractions among the following ? 13/15 15/19 27/31 11/13 13/15 15/19 27/31 11/13 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 11/13 = 0.8461,13/15 = 0.8666,27/31 = 0.87,15/19 = 0.789
Number System 17580 x 1.8 - 13720 x 2.1 = ? x 2.4 1160 1140 1120 1180 1160 1140 1120 1180 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2.4 x ? = 31644 - 28812 = 2832∴ ? = 2832/2.4= 1180
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 ? 90/190 92/190 89/190 91/190 90/190 92/190 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
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