Number System If (17)3 is subtracted from the square of a number, the answer so obtained is 2143. What is the number ? 83 82 81 84 83 82 81 84 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (17*17*17) = 2143or x² = 2143 + 4913 = 7056∴ x = 84
Number System The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: 289 289/290 290/289 1/289 289 289/290 290/289 1/289 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be a and b. Then,ab = 17, a = 1 and b = 17So, 1/a2 + 1/b2 = (a2 + b2)/a2 b2 = (12 + 172)/(1 * 17)2 = 290/289
Number System 1827÷ 36 x ?=162.4 2.6 4.3 1.9 3.2 2.6 4.3 1.9 3.2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3.2
Number System If the product of two successive positive integers is 4692, what is the smaller number ? 70 66 68 64 70 66 68 64 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∵ 68 x 69 = 4692
Number System Find the greatest number which leaves the same remainder when it divides 25, 57 and 105. 16 8 12 18 16 8 12 18 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 105 - 57 = 4857 - 25 = 32105 - 25 = 80The H.C.F of 32, 48 and 80 is 16.
Number System What is the difference between the local value of 7 and 5 in the number 2574? 413 570 403 430 413 570 403 430 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 500 – 70 = 430
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