Who is the author of the book "The India

If a + b = 56 and (a – b)² = 496, find the value of the product of a and b.

In △ ABC, AB = AC. A circle drawn through B touches AC at D and intersect AB at P. If D is the midpoint of AC and AP = 2.5 cm, then AB is equal to:

1/3 + 1/15 + 1/35 + 1/63 + 1/99 = ?

A company’s expenditure on three departments over four years is as follows (in thousands):

If 10x² – 6xy+y² – 4x+4= 0, then find the value of (3x+2y).

Find the 36th term of the series 25, 29, 33……

If √e + (1/√e) = 10, then find the value of e + (1/e).