What beat frequencies are possible with tuning forks of frequencies 258, 263, and 267 Hz?

Answer 1

f1 = 263 -258 = 5Hz
f2 = 267 - 258 = 11 hz,
f3 = 267-263 = 4 Hz

Answer 2

it marked me wrong for this

Answer 3

What beat frequencies are possible with tuning forks of frequencies 258, 263, and 267 Hz ?
Enter your answers in ascending order separated by commas.
f1,f2,f3 = 4,5,9 Hz