Coefficient of x⁷ in the expansion of (1 – 2x + x³)⁶ is

Coefficient of x⁸ in the expansion of (1 + 2x – x³)⁶ is

If the middle tern in the expansion of  is 40 then x equals

If the term independent of x in the expansion of  is 405, then kequals

In the third term in the expansion  is 2, then x equals

If the fifth term in the expansion of  does not depend upon x, then  equals

 the greatest term in absolute value in the expansion of (a +b)⁵⁰ is

Coefficient of the term independent of x in the ex pansion of  is

Value (s) of x for which the fourth term in the ex pansion of  is 40 is (are)

If x^2r occurs in  then n – 2r must be of the form