985 : 874 : 763

Answer:  652

In such type of questions, we are expected to find the required number by deducing the pattern that other numbers of the series follow.

The given series is 985 : 874 : 763 : ?

Upon observing, we can clearly notice that the next number is derived by subtracting 111 from the previous number in this series.

985-111=874

874-111=763

As a result, the fourth number will be 763 – 111 = 652.