Question

Find the missing number from the given series 16 06 68 88

Answer 1

Answer is 78

Explanation:

First we turn that above series as upside-down,

86 '¿ '88 '89 '90 '9I.

So clearly we can tell that ¿ is to be replaced by 87.
.
86 '87 '88 '89 '90 '9I.

Finally we turn it back right-side up again, 

I6, 06, 68, 88, L8, 98.

So the answer is 78