Number System Find the least number with which 16200 should be multiplied, to make it a perfect cube. 45 36 360 48 45 36 360 48 ANSWER DOWNLOAD EXAMIANS APP
Number System Ratio between two numbers is 3: 4 and their sum is 420. Find the smaller number? 160 240 140 180 160 240 140 180 ANSWER DOWNLOAD EXAMIANS APP
Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 49 50 48 47 49 50 48 47 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System If A = 1, B = 3, C = 5 and so on, what do the numbers 3, 9, 7 stand for BAT BED CAR CAT BAT BED CAR CAT ANSWER EXPLANATION DOWNLOAD EXAMIANS APP BED
Number System What is the least number, which is perfect square but contains 2700 as its factor? 2700 1800 10800 5400 2700 1800 10800 5400 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 900 * 3 * 3 = 8100
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 ? 27/143 29/145 28/144 30/146 27/143 29/145 28/144 30/146 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