In a Gp the sixth term is 24,and the 13term is 3divide by 16,the 20term of the Gp

ar^5 = 24

ar^12 = 3/16

divide them:
r^7 = (3/16) / 24
r^7 = 1/128
r = 1/2

back into ar^5 = 24
a(1/32) = 24
a = 768

term(20) = 768(1/2)^19 = 768/524288 = 3/2048

clearly the bot is wrong (again)
we could actually do this the long tedious way

the terms would be
768, 384, 192, 96, 48, 24, 12, 6, 3, 3/2, 3/4, 3/8, 3/16, 3/32, 3/64, 3/128,
3/256, 3/512, 3/1024, 3/2048 <---- I am right, also notice that 3/16 is the 13th
term, and 24 is the 6th term.

The 20th term of the GP is 1/4.