If the first and last terms of the geometric progression (G.P.) as given below are 3 and 36, and r = 3, then the number of terms, in the given G.P. are:
Answer & explanation
Correct answer: option 1
The formula for the nth term in a GP:
an = a1 × r(n-1)
Substituting the given values:
729 = 3 × 3(n-1)
729 = 3(n)
36 = 3(n)
n = 6