Forming a committee from $4$ gentlemen and $4$ ladies with certain conditions 
From $4$ gentlemen and $4$ ladies a committee of $5$ is to be formed .
  If the committee consists of $1$ president, $1$ vice president and $3$ secretaries.
  What will be the number of ways of selecting the committee with at least $3$
  women such that at least one women holds the post of president or vice-president?

I tried 
Case $1$
$3W2M$
$\dbinom{4}{1}\times \dbinom{4}{1} \times \dbinom{3}{2} \times \dbinom{3}{1}=144 $
$+$
$\dbinom{4}{1}\times \dbinom{3}{1} \times \dbinom{2}{1} \times \dbinom{4}{2}=144 $
Case $2$
$4W1M$
$\dbinom{4}{1}\times \dbinom{3}{1} \times \dbinom{2}{2} \times \dbinom{3}{1}=36 $
$+$
$\dbinom{4}{1}\times \dbinom{4}{1} \times \dbinom{3}{3}=16 $
Total ways=$338$.
But the answer given is $512$.
I look for a short and simple way.
I have studied maths up to $12$th grade.

As pointed out in a comment, there are numerous errors in your answer.
Pres-Veep . . . . . Secretaries
W-W . . . . . . . . . 2W,1M or 1W-2M: $\left[{4\choose1 }{3\choose 1}\right]\left[{2\choose2}{4\choose1} + {2\choose 1}{4\choose 2}\right]= 192$
W-M or M-W . . . . 3W or 2W,1M: $\left[2{4\choose1}{4\choose1}\right]\left[{3\choose 3}+{3\choose2}{3\choose1}\right]=320$ 
