Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 396 378 382 343 396 378 382 343 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System A number when, 28 subtracted from it reduces to its one third. What is the value of 50% of that number? 84 21 24 42 84 21 24 42 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2/3 x = 28 => x = 4242 * 1/2 = 21
Number System Complete the series : 11, 12, 17, 18, 23, 24 ... 30 14 None of these 12 30 14 None of these 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP None of these
Number System What number should come in the place of (?) in the following number series ? 1, 4, 9, 25, 49, ?, 169, 289, 361 225 121 11 321 225 121 11 321 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The series is (Prime No.)²So it is (11)² = 121
Number System A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ? 37/52 31/58 32/51 34/55 37/52 31/58 32/51 34/55 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Probability of having no red ball is9C3 / 12C3 = 21/55Probability of having at least one red ball is 1 - 21/55 = 34/55
Number System If 5/7 of a number is 145, what is 180% of that number ? 355.4 345.4 365.4 375.4 355.4 345.4 365.4 375.4 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
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