Number System Which one of the following represents the sum of the first n even numbers? N2+ 1 N(N + 1) N(N – 1) N2 N2+ 1 N(N + 1) N(N – 1) N2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System If 70% of an equal to 40% of b, then ratio between a and b is? 7: 11 None 7: 4 4: 7 7: 11 None 7: 4 4: 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
Number System What least number shall be added to 4700 to make it a perfect square ? 61 81 71 91 61 81 71 91 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System Find the smallest number which should be multiplied with 520 to make it a perfect square. None of these 55 120 30 None of these 55 120 30 ANSWER DOWNLOAD EXAMIANS APP
Number System What is the sum of the local values of the digits 2, 3, 4, 5 in the number 2345? 2345 2435 5243 2105 2345 2435 5243 2105 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2000 + 300 + 40 + 5 = 2345
Number System If the sum of the two numbers is 22 and the sum of their squares is 404, then the product of the numbers is: 80 44 88 40 80 44 88 40 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, (x + y) = 22 and x2 + y2 = 404 Now, 2xy = (x + y)2 - (x2 + y2) 2xy= 222 - 404 = 484 - 404 = 80xy = 40
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