... Friday 2 19. Which number should come next in the series 1, 3, 6, 10,15 , ……… Answer: 21 20 . Which number should come next in the series? 13, 57, 911, 1315, 1719 Answer: 21 23 21 . If ... Answer: Fifth 28 . The numbers, 3-7 -2- 4-8-1-5, are read backwards as …………… Answer: 5-1-8-4 -2- 7-3.3 29 . The odd numbers in this group add up to an …. Number: 15, 32, 5, 13, 82, 7. Answer: ... corresponds to this sequence of numbers "3, 5, 12 ……” Answer: 2 24 . 27 minutes before 7 o'clock is ……… minutes past 6 o'clock Answer: 33 25 . If written backwards, the number, "one...