Number System Which one of the following represents the sum of the first n even numbers? N2 N(N – 1) N2+ 1 N(N + 1) N2 N(N – 1) N2+ 1 N(N + 1) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System What is 846 times 323 ? 273258 264258 283298 293798 273258 264258 283298 293798 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 846 x 323 = 273258
Number System On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is: 47649 47619 48619 47719 47649 47619 48619 47719 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP By hit and trail, we find that47619 * 7 = 333333.7) 333333 (47619 333333---------------- 0
Number System 1827÷ 36 x ?=162.4 2.6 3.2 1.9 4.3 2.6 3.2 1.9 4.3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3.2
Number System Complete the series : 81, 69, 58, 48, 39 ........ 29 31 28 30 29 31 28 30 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 31
Number System The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number. 25 50 12.5 75 25 50 12.5 75 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ x + y = 12 ...........(i)10x + y - (10x + x) = 18or 10x + y - 10y - x = 18or 9x - 9y = 18∴ x - y = 2From (i) and (ii), x = 7, y = 5∴ Number = 75
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