Number System Which one of the following represents the sum of the first n even numbers? N(N + 1) N2 N2+ 1 N(N – 1) N(N + 1) N2 N2+ 1 N(N – 1) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System What is the missing number in this series? 8 2 14 6 11 ? 14 6 18 12 7 2 3 9 7 2 3 9 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 9
Number System In a two-digit number, the digit in unit's place is two more than three times the digit in ten's place. If the sum of the two digits is 10, what is the number ? 24 28 18 22 24 28 18 22 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ y = 3x + 2 .......(i)And, x + y = 10 ......(ii)From (i) and (ii), x = 2, y = 8∴ Number = 28
Number System The sum of three consecutive multiples of 3 is 72. What is the largest number? 24 36 21 27 24 36 21 27 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be 3x, 3x + 3 and 3x + 6.Then,3x + (3x + 3) + (3x + 6) = 729x = 63x = 7Largest number = 3x + 6 = 27.
Number System If 2^(2x-1) = 8^(3-x), then the value of x is: 9 5 2 6 9 5 2 6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2
Number System What should come in the place of ' ? ' in the following number series ? 2, 5, 9, 19, 37, ? 75 78 77 76 75 78 77 76 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2 x 2 + 1 = 5;5 x 2 - 1 = 99 x 2 + 1 = 19: 19 x 2 - 1 = 3737 x 2 + 1 = 75
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