List of top General Aptitude Questions on Numerical Estimation asked in GATE CE

In the following series, identify the number that needs to be changed to form the Fibonacci series. 1, 1, 2, 3, 6, 8, 13, 21,...

What is the relationship between P & Q?
\(\left(\frac{P}{Q}\right)^{\frac{P}{Q}} = P^{\frac{P}{Q}-1}\)

Find the value of x 
3, 7, 15, x, 63, 127, 255