Number System What is the sum of all the composite numbers up to 20? 130 128 132 131 130 128 132 131 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132
Number System 432+2170+35=? 494 729 678 523 494 729 678 523 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 494
Number System If 70% of an equal to 40% of b, then ratio between a and b is? 7: 11 4: 7 7: 4 None 7: 11 4: 7 7: 4 None ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
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 ? 80/150 80/151 80/153 80/152 80/150 80/151 80/153 80/152 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 3√103820 x 3√274620 = ? 3055 3065 3035 3045 3055 3065 3035 3045 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3√103820 = 47 and 3√274620 = 65 ∴ ? = 47 x 65 = 3055
Number System In how many different ways can the letters of the word 'DETERMINE' be arranged ? 63480 62480 60480 61480 63480 62480 60480 61480 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP No. of arrangements = 9! / 3! Because, E comes 3 times = 60480
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