11 = 11*1
3=3*1
least common multiple = 3*11*1 = 33
33 days from today he will practice the guitar and the trombone
I hope this helps. if not, feel free to leave a feed back.
Sum of n terms in a geometric progression is given by Sn = a1 (1 - r^n) / (1 -r)
3( 1 - 4^6) / (1-4)
= 4,095
33 ✨ ✨✨✨✨✨✨✨espero que te sirva