Number System (1024—263—233)÷(986—764— 156) =? 10 8 6 None of these 10 8 6 None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8
Number System On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is: 47719 47649 48619 47619 47719 47649 48619 47619 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP By hit and trail, we find that47619 * 7 = 333333.7) 333333 (47619 333333---------------- 0
Number System 3√103820 x 3√274620 = ? 3055 3035 3045 3065 3055 3035 3045 3065 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3√103820 = 47 and 3√274620 = 65 ∴ ? = 47 x 65 = 3055
Number System A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ? 29/145 28/144 30/146 27/143 29/145 28/144 30/146 27/143 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 5 + 4 + 4 = 13∴ n(S) = 13C3 = 2862 blue balls can be selected from 4 balls in 4C2 = 6 ways and the remaining one ball is to be selected from 9 balls in 9C1 = 9 ways ∴ n(E) = 6 x 9∴ P(E) = 6 x 9/286 = 27/143
Number System In how many different ways can the letters of the word "MOBILIZE" be arranged ? 18456 20160 17453 19765 18456 20160 17453 19765 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160
Number System Two-third of a positive number and 25/216 of its reciprocal are equal. The number is: 12/5 25/144 144/25 5/12 12/5 25/144 144/25 5/12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,2/3 x = 25/216 * 1/xx2 = 25/216 * 3/2 = 25/144 x = 5/12
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