The difference between the 13th and 12th Fibonacci number is __________ (if the first two numbers are F1 = 1, F2 = 1).
89
In the Fibonacci sequence each term is the sum of the two terms just before it.
Fibonacci rule: Fn = Fn-1 + Fn-2, so F13 - F12 = F11
Sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233
F11 = 89, F12 = 144, F13 = 233
Difference = 233 - 144 = 89
Check: 89 is exactly the 11th term, as the rule predicts.
Hence, 89.
Similar Questions
In an A.P, S1, S2, S3 are sum of first 15, 30, 45 terms respectively. If S3 = 300, S2 = 150 find S1.
Important Questions from Number Series
What will come in place of question mark (?) in the following number series?
2, 5, 11, 23, 44, 77, ?
What will come in place of question mark (?) in the following number series?
31, 32, 36, ?, 61, 86
What will come in the place of question mark (?) in the following number series?
3, 6, 18, ?, 630, 6930
What should come in place of the question mark ‘?’ in the following number series?
60, 40, 50, ?, 180, 460
A series is given with one term wrong. Select that wrong term from the given alternatives.
J12, M24, P48, S96, U192
