Number System The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: 289 289/290 1/289 290/289 289 289/290 1/289 290/289 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 On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is: 47619 47719 47649 48619 47619 47719 47649 48619 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP By hit and trail, we find that47619 * 7 = 333333.7) 333333 (47619 333333---------------- 0
Number System The square root of 0.0081 is: 0.91 0.009 0.09 0.9 0.91 0.009 0.09 0.9 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 0.09
Number System If a number is subtracted from its square we get 272. Find the number? 17 24 22 14 17 24 22 14 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x2 – x = 272 => x =17
Number System 3251 + 587 + 369 - ? = 3007 1375 1300 1250 1200 1375 1300 1250 1200 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let 4207 - x = 3007 Then, x = 4207 - 3007 = 1200
Number System In how many different ways can the letters of the word "MOBILIZE" be arranged ? 19765 17453 20160 18456 19765 17453 20160 18456 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160
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