If x = a + 1a and y = a –1a then x4 + y4 - 2x²y² = ?
৪
8
১৬
None of the above
The average age of a group of 15 employees is 24 years. If 5 more employees join the group, the average age increases by 2 years. Find the average age of the new employees?
35
30
২৪
32