So $ n-1 = 4 $ → $ n = 5 $? No: $ k = n-1 $, so $ n-1 = 4 $ → $ n = 5 $? But wording: after how many weeks — if at end of week 4, and we want first time, it’s after 4 weeks.

Sun, 03 May 2026 08:00:11 +0000

Content under review