Question

If the first three Fibonacci nos. are x1=1, x2=1 and x3=2, what is the least value of n for which xn>60?

Answer 1

11

Explanation:

The first 12 terms of the sequence are ...

1 1 2 3 5 8 13 21 34 55 89 144

The first term that is greater than 60 is the 11th term, 89.

n = 11