Number System 432+2170+35=? 523 678 494 729 523 678 494 729 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 494
Number System A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ? 29/145 27/143 30/146 28/144 29/145 27/143 30/146 28/144 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 5 + 4 + 4 = 13∴ n(S) = 13C3 = 2862 blue balls can be selected from 4 balls in 4C2 = 6 ways and the remaining one ball is to be selected from 9 balls in 9C1 = 9 ways ∴ n(E) = 6 x 9∴ P(E) = 6 x 9/286 = 27/143
Number System (12.04 x 7.5 + 0.8 x 45) ÷ 3 = ? 42.1 45 42.6 54.7 42.1 45 42.6 54.7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (90.3 + 36) ÷ 3 = 126.3/3 = 42.1
Number System In how many different ways can the letters of word 'BIOLOGY' be arranged ? 2520 2678 2410 2367 2520 2678 2410 2367 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In BIOLOGY total 7 letters are there but O comes twice.∴ Number of arrangements = 7!/2! = 2520
Number System In how many different ways can the letters of the word "MOBILIZE" be arranged ? 20160 19765 17453 18456 20160 19765 17453 18456 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160
Number System (√6 + 1)² = ? + 2√6 5 7 8 6 5 7 8 6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = (√6 + 1)² - 2√6= (√6)² + 2 x √6 + 1 + 1² - 2√6= 6 + 2√6 + 1 - 2√6 = 6 + 1 = 7
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