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 ? 31/58 32/51 37/52 34/55 31/58 32/51 37/52 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 The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is: 30 40 20 None of these 30 40 20 None of these ANSWER DOWNLOAD EXAMIANS APP
Number System In how many different ways can the letters of the word FORMULATE be arranged ? 372880 392880 362880 382880 372880 392880 362880 382880 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP No. of letters = 9! = 9*8*7*6*5*4*3*2*1 = 362880
Number System Find the average of the following set of scores 450, 1050, 12, 390, 143, 286, 550, 999 495 490 485 480 495 490 485 480 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Required average score = (450 + 1050 + 12 + 390 + 143 + 286 + 550 + 999) / 8 = 3880 / 8 = 485
Number System What is 50% of 40% of Rs. 3,450? 670 630 690 640 670 630 690 640 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 40% * 3450 = 1380then, 50 % * 1380 = 690
Number System If the product of two successive positive integers is 4692, what is the smaller number ? 70 66 64 68 70 66 64 68 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∵ 68 x 69 = 4692
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