Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 50 48 49 47 50 48 49 47 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System How many numbers up to 300 and 700 are divisible by 2, 3 and 7 both together? 10 8 9 11 10 8 9 11 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (700 – 300)/42 = 9 22/42 => 9 Numbers
Number System The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is: 20 40 None of these 30 20 40 None of these 30 ANSWER DOWNLOAD EXAMIANS APP
Number System 124, 235, 447, 760, 1174, ? 1389 1689 1489 1589 1389 1689 1489 1589 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP +111, +212, +313, +414
Number System A basket contains eight white and ten black balls. Two draws of one ball each are made without replacement. What is the probability that one ball is white and the other ball is black ? 80/153 80/152 80/151 80/150 80/153 80/152 80/151 80/150 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Two balls can be drawn from 18 balls in 18C2 Ways, ie 153 ways. One white from 8 white balls can be drawn in 8C1 = 8 ways and one black ball from 10 black can be drawn in 10C1 = 10 ways.∴ n(S) = 153, n(E) = 8 x 10 = 80∴ P(E) = 80/153
Number System On dividing number by 357, we get 39 as remainder. On dividing the same number by 17, what will be the remainder? 11 3 5 0 11 3 5 0 ANSWER DOWNLOAD EXAMIANS APP
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