Number System The sum and the product of two numbers are 25 and 144 respectively, the difference of the number is? 5 11 7 3 5 11 7 3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 25xy = 144(x- y)2 = (x + y)2 – 4xy(x- y)2 = 625 – 576 => (x – y) = 7
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 30/146 28/144 27/143 29/145 30/146 28/144 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 7.8 x 4.5 x 4.2/0.14 = ? 1032 1053 1087 1012 1032 1053 1087 1012 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 7.8 x 4.5 x 4.2/0.14 = 1053
Number System Two numbers have a H.C.F of 16 and a product of two numbers is 2560. Find the L.C.M of the two numbers? 160 150 170 140 160 150 170 140 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP L.C.M of two numbers is given by(Product of the two numbers) / (H.C.F of the two numbers) = 2560/16 = 160.
Number System On dividing number by 5, we get 3 as remainder. What will be the remainder when the square of this number is divided by 5? 0 1 4 2 0 1 4 2 ANSWER DOWNLOAD EXAMIANS APP
Number System A certain number successively divided by 2, 5 and 7 leaves remainders 1, 2 and 3 respectively. When the same number is divided by 70, what is the remainder? 35 34 36 33 35 34 36 33 ANSWER DOWNLOAD EXAMIANS APP
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