#
- find the coefficient of x
^{-17 }on the expansion of (x^{4}-1/x^{3})^{15.}. - find the term independent of x in the expansion of(1/2x
^{1/3}+x^{-1/5)} ^{8.} - find the coefficient of x
^{8} *y16 in the expansion of (x+y)^{18.}

^{-17 }on the expansion of (x^{4}-1/x^{3})^{15.}.^{1/3}+x^{-1/5)}^{8.}^{8}*y16 in the expansion of (x+y)^{18.}