Find the 6th term in the geometric sequence 3, 12, 48,···.
Find the 7th term for the geometric sequence in which
a2 = 24 and a5 = 3.
Substitute 24 for a2 and 3 for a5 in the formula
an = a1 · rn – 1.
Substitute this expression for a1 in the second equation and solve for r.
Substitute for r in the first equation and solve for a1.
Now use the formula to find a7.