C(♯4) 7-string bass chord

How to play C(♯4) on 7-string bass

The most common way, the first shape above: your index finger on the A string at the 3rd fret, your middle finger on the D string at the 4th fret, your little finger on the G string at the 5th fret and your ring finger on the C string at the 4th fret. Don’t play the B, E and F strings.

From the B string x x 3 4 5 4 x (x: not played, 0: open)

What notes are in C(♯4)?

C(♯4), C major with sharp four, no fifth, is C, E and F♯: the root (C), the major third (E) and the augmented fourth (F♯). Its formula is 1 3 ♯4.