Number System Which one of the following represents the sum of the first n even numbers? N2 N2+ 1 N(N – 1) N(N + 1) N2 N2+ 1 N(N – 1) N(N + 1) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System If 1.5 x= 0.04 y, then the value of (y-x) (y+x) is: 77/73 93/77 83/77 73/77 77/73 93/77 83/77 73/77 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 73/77
Number System A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is: 42 24 18 81 42 24 18 81 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the ten's and unit's digit be x and 8/x respectively. Then, (10x + 8/x) + 18 = 10 * 8/x + x 9x2 + 18x - 72 = 0 x2 + 2x - 8 = 0 (x + 4)(x - 2) = 0 x = 2 So, ten's digit = 2 and unit's digit = 4. Hence, required number = 24.
Number System The square root of 3 + “5 is : “(5/2) + “(1/2) “3 /2 - 1/”2 “3 /2 + 1/”2 “5 /2 - 1/”2 “(5/2) + “(1/2) “3 /2 - 1/”2 “3 /2 + 1/”2 “5 /2 - 1/”2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP “(5/2) + “(1/2)
Number System A certain number of two digits is three times the sum of its digits. If 45 be added to it, the digits are reversed. The number is: 27 30 22 24 27 30 22 24 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 27
Number System (4 86%of 6500) ÷ 36 =? 677.5 777.5 877.5 977.5 677.5 777.5 877.5 977.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 877.5
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