In how many different number of ways 4 boys and 3 girls can sit on a bench such that girls always sit together.  Options.
A) 720	B) 740	C) 770	D) 780	E) 790
720   Option '720'
<result>A</result>
In how many different number of ways 4 boys and 3 girls can sit on a bench such that girls always sit together.