+1 vote
153 views

@valshall 2$4$8$? actually i have typed 2Dollar4Dollar8Dollar. But somehow that$ is not showing up.
I think some $is missing in your answer 2$ 4 $8$...

@amitabh is right ..don't know why dollar is not showing

dollar b/w 4 nd 8 should be there and after 8 only one dollar
Nopes

+1 vote

SDT evaluation

S --> XY

S --> ZXY

S --> ZX*XY

S --> ZX*ZXY

S --> ZX*ZZXY

@amitabh...see this
that is what i have derived...complete the derivation you will get the same answer.

Is this right?

No. See where you are going wrong is : ZX when reduced to X --->prints $. But when epsilon is reduced to X,it doesn't print$. See the grammar carefully.
She has printed the second dollar where actually  the first dollar is printed. But second dollar will also be printed in the subsequent step when again zx reduces to X. So her final answer is correct.

2dollar48 dollar dollar is possible.ZX is reduced to X twice at last