Series

 Find the missing number in the series. 2, 3, 10, 15, ? A) 25 B) 24 C) 26 D) 28 Correct Answer :26 Explanation :The pattern is 1² + 1 = 2 2² - 1 = 3 3² + 1 = 10 4² - 1 = 15 5² + 1 = 26. So, the missing number is 26. 1000, 200, 40, … What number should come next? A) 8 B) 10 C) 15 D) 20 Correct Answer :8 Explanation :This is a simple division series. Each number is divided by 5. 1000/5=>200 200/5=>40 40/5=>8 Find the missing number in the series. 2, 5, 3, 8, 5, 11, 6, ? , 9 A) 12 B) 13 C) 14 D) 15 Correct Answer :15 Explanation :2, 5, 3, 8, 5, 11, 6, ? , 9 2 + 3 = 5, 3 + 5 = 8, 5 + 6 = 11, missing number = 6 + 9 = 15 5, 7, 10, 15, 22, 33, 46 ,___, ___ Which one of the alternatives will come at the end of the above sequence ? A) 61,79 B) 63,82 C) 65,85 D) 59,71 Correct Answer :63,82 Explanation :The difference between the adjacent numbers itself form a series of consecutive prime numbers 5 5+2 = 7 7+3 = 10 10+5 =15 15+7 = 22 22+11 = 33 33+13 = 46 46+17 = 63 63+19 = 82 The missing number in 1,1,4,8,9,?,16,64 is: A) 27 B) 23 C) 21 D) 20 Correct Answer :27 Explanation :the pattern of series 1=12, 1=13, 4=22 , 8=23, 9=32, 27=33, 16=42, 64=43 Find the missing alphabets in the following: a_bc_a_bcda_ccd_bcd_ A) abdbdb B) acbdbb C) adbbad D) bbbbbb Correct Answer :adbbad Explanation :The series is aabcd / abbcd / abccd / abcdd. Thus, answer is adbbad