List of top Data Interpretation & Logical Reasoning (DILR) Questions asked in Banaras Hindu University Postgraduate Entrance Test

If the Republic Day of India in 1980, falls on Saturday, X was born on March 3, 1980 and Y is older to X by four days, then Y's birthday fell on:
What should come in the place of question mark (?) in the following series:
CO3KP, DO4KQ, EO5KR, FO6KS, ?
Identify the incorrect number in the following series:
What replaces question mark (?) in the series given below:
88, 64, 24, ?
If 'A + B' means 'A is the son of B', 'A - B' means 'A is the wife of B', 'A × B' means 'A is the brother of B', 'A ÷ B' means 'A is the mother of B', and 'A = B' means 'A is the sister of B', what does P + R - Q mean?