Explanation:

Let’s break it down, step-by-step:

- Seven people (A, B, C, D, E, F, G) need to be assigned one day each, Monday to Sunday.

- G goes on Friday.

- D goes on the second day of the week ? that’s Tuesday.

- Three people go between D and F. So if D is Tuesday, F must be Saturday (counting: Tuesday, Wed, Thu, Fri, [Sat]).

- One person between G and C. Since G is Friday, C could be Wednesday or Sunday.

- A goes before C.

- Number of persons after C equals those before G. G is Friday (the 5th day), so there are two after G. So C needs to be on Wednesday (if C were on Sunday, can’t satisfy condition).

- Place everyone:

- Monday: __

- Tuesday: D

- Wednesday: C

- Thursday: __

- Friday: G

- Saturday: F

- Sunday: __

- A goes before C, so he must be on Monday or Tuesday (but Tuesday is D).

- Three between D (Tue) and F (Sat) is correct so far.

- One between G (Fri) and C (Wed). So, C on Wednesday, G on Friday, Thursday is between them. That fits.

- Number of persons after C (Wed): Thursday, Friday, Saturday, Sunday (four) — which does *not* match with those before G (Monday, Tuesday, Wednesday — three). Wait, something’s off. Actually, let's check alternatives.

Let’s try C on Sunday (after all, Thursday between G and C).

- G: Friday, C: Sunday, one between them (Saturday).

- Now, after C: none, before G: four (Mon to Thu). Doesn't fit the “equal number” condition.

Again, with C on Wednesday:

- After C: three (Thu, Fri, Sat, Sun — but actually, that’s four),

- Before G: four (Mon, Tue, Wed, Thu)

- No good.

Wait, let’s try Thursday for C:

- Between G (Friday) and C (Thur): Friday after Thursday — not possible.

- Between C (Thur) and G (Fri): G is after C, but that’s zero between them.

Let’s instead focus on this: Number of persons after C equals before G.

If G is on Friday (person 5), there are two after G (Sat and Sun). So, C should sit at person 3 to have four after and G at five. But G is set to Friday, which is fifth.

Alternatively, count after C if C is on Wednesday (person 3): after C, there are Thursday, Friday, Saturday, Sunday (four). Persons before G are Monday, Tuesday, Wednesday, Thursday (also four). Now, that's equal.

So, C on Wednesday, G on Friday, D on Tuesday, F on Saturday.

Now, fill the rest:

- One between G (Friday) and C (Wednesday): Thursday.

- So Thursday in between, that fits.

- A goes before C—so not Wednesday or after. Available: Monday, Tuesday. Tuesday is D. So A is on Monday.

- B can't be Monday or Thursday. So Thursday out.

- Remaining: Sunday and Thursday, for B and E. B can't be Monday or Thursday, so B is Sunday, E is Thursday.

Final lineup:

- Monday: A

- Tuesday: D

- Wednesday: C

- Thursday: E

- Friday: G

- Saturday: F

- Sunday: B

So, the person going just after G (Friday) is F (Saturday).

Option 3: F is correct.

To sum up:

- After G (Friday) comes F (Saturday).

- All constraints check out.

- The right answer is F (Option 3).

If you chose option 3, you got it. Nice work.