• 35

  • 75

  • 24

  • 15


The given series is in the below pattern, First term = 10 Second term = First term + 5 = 15 ⇒ Second term = 10 + 5 =15 , Third term = Second term + 9 = 24 ⇒ Third term = 15 + 9 = 24 , Similarly , we can find the all others terms also. 24 + 13 = 35, is wrong. It should be 37. Fourth term = Third term + 13 = 37 + 17 = 54 , Fifth term = Fourth term + 17 = 54 + 21 = 75 , Sixth term = Fifth term + 21 = 75 + 25 = 100 The difference in successive nos. 9 – 5 = 13 – 9 = 17 – 13 = 21 - 17 = 4. Hence, 35 is wrong. It should be 37.