# What number should fill the blank?

Look at the series:70, 71, 76, ____, 81, 86, 70, 91, …….

(a) 71

(b) 70

(c) 96

(d) 80

**Answer: (b) 70 **

**Explanation:-**

70 and 71 + 5 = 76,

Same as, 70 and 81 + 5 = 86,

70 and 91 + 5 = 96.

Then, the missing number is 70.

Hence, the correct answer is option (b) 70.