Number System What value should come in place of ? in the given number series ? 15, 51, 162, 498, 1509, ? 4545 7878 3434 5656 4545 7878 3434 5656 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 15, (15 + 2) x 3 = 51,(51 + 3) x 3 = 162, (162 + 4) x 3 = 498, (498 + 5) x 3 = 1509(1509 + 6) x 3 = 4545
Number System Find the greatest four digit number which leaves respective remainders of 2 and 5 when divided by 15 and 24. 9565 None of these 9974 9125 9565 None of these 9974 9125 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Since the difference between the divisors and the respective remainders is not constant, back substitution is the convenient method. None of the given numbers is satisfying the condition.
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 89/190 91/190 92/190 90/190 89/190 91/190 92/190 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
Number System If the three fourth of a number is subtracted from the number; the value so, obtained is 163. What is that number ? 689 678 692 652 689 678 692 652 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Number x (1 - 3/4) = 163∴ Number = 163 x 4 = 652
Number System What least number shall be added to 4700 to make it a perfect square ? 71 61 81 91 71 61 81 91 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System What is the sum of the local values of the digits 2, 3, 4, 5 in the number 2345? 2345 2435 5243 2105 2345 2435 5243 2105 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2000 + 300 + 40 + 5 = 2345
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