Number System 7.8% of 12.5 + 2.5% of 161 = ? 12 2 9 5 12 2 9 5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 7.8 x 12.5/100 + 2.5 x 161/100= 0.975 + 4.025= 5
Number System A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ? 34/55 37/52 32/51 31/58 34/55 37/52 32/51 31/58 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Probability of having no red ball is9C3 / 12C3 = 21/55Probability of having at least one red ball is 1 - 21/55 = 34/55
Number System Sum of the digits number is 8 and their product is 12. Find the difference between the digits? 4 2 None 6 4 2 None 6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 8xy = 12(x – y)2 = (x + y)2 – 4xy (x – y)2 = 64 – 48 => (x – y) = 4
Number System The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is? 4 6 Nothing can be said. 1 4 6 Nothing can be said. 1 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (10x + y) – (10y + x) = 54x – y = 6
Number System In how many different ways can the letters of the word 'DETERMINE' be arranged ? 63480 60480 61480 62480 63480 60480 61480 62480 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP No. of arrangements = 9! / 3! Because, E comes 3 times = 60480
Number System Supply the missing figure : 1, 4, 9, 16, 25 .... 49 42 23 16 36 42 23 16 36 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 36
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