Number System Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number? N(N + 1) N2 + 1 N2 N(N + 1)/2 N(N + 1) N2 + 1 N2 N(N + 1)/2 ANSWER DOWNLOAD EXAMIANS APP
Number System What least number shall be added to 4700 to make it a perfect square ? 71 61 91 81 71 61 91 81 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 The difference between two integers is 5. Their product is 500. Find the numbers. 20, 25 15, 20 21, 26 30, 25 20, 25 15, 20 21, 26 30, 25 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the integers be x and (x + 5). Then, x(x + 5) = 500 x2 + 5x - 500 = 0 (x + 25)(x - 20) = 0 x = 20So, the numbers are 20 and 25.
Number System In how many different ways can the letters of the word FORMULATE be arranged ? 392880 362880 372880 382880 392880 362880 372880 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, 999 495 480 485 490 495 480 485 490 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Required average score = (450 + 1050 + 12 + 390 + 143 + 286 + 550 + 999) / 8 = 3880 / 8 = 485
Number System Which is the smallest fractions among the following ? 11/13 27/31 13/15 15/19 11/13 27/31 13/15 15/19 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 11/13 = 0.8461,13/15 = 0.8666,27/31 = 0.87,15/19 = 0.789
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