The degree of recurrence relation an = 2an-2 + 5an-15 is ?
The Greatest Common Divisor (GCD) of 28 × 37 × 56 and 22 × 34 × 53 is ?
The sum of the first 24 positive odd integers is ?
In how many ways can an organization containing 21 members elect a president, treasurer and secretary (assuming no person is elected to more than one position)?
