Two circles touch each other internally. The radius of the smaller circle is 6 cm and the distance between the centre of two circles is 3 cm. The radius of the larger circle is

If x = 313- 3-13, then 3x2 + 9xis equal to

If x = 222, y = 223, z = 225 then the value ofx3 + y3 + z3 - 3xyz is

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observations is

What least value must be assigned to '*' so that the numbers 451 *  603 is exactly divisible by 9?

If  C+1C = 3, then what is the value of C3+1C3 = ?

If 4x + 1x = 5, (x≠0), then the value of 5x4x2+10x+1 is

Value of (cos 53° - sin 37°) is