Finding fundamental frequency with length and successive frequencies

[cyclingnerd]

Homework Statement

Standing waves on a 1.3 m long string that is fixed at both ends are seen as successive frequencies of 24Hz and 48 Hz. What is the fundamental frequency?

Homework Equations

fo = nv/4L

The Attempt at a Solution

Okay, so I don't really know if that is the right equation, so I can't really see how I'm supposed to solve for this... Please help!

 

[klawlor419]

What do they mean by "are seen as successive frequencies"?

 

[haruspex]

What do they mean by "are seen as successive frequencies"?

They mean that standing waves can exist on the string at those two frequencies, but at no frequency in between.
cyclingnerd (I could say, fellow cyclingnerd ) how many wavelengths would there be on a string vibrating at its fundamental frequency? How many at successive harmonics?