Given 11th term of the Fibonacci sequence is 89 and 13th term of is 233
We know that a number in Fibonacci sequence is got by adding the previous two consecutive numbers.
11th term + 12th term = 13th term
89 +12th term =233
∴ 12th term = 233 – 89 = 144
∴ 12th term in Fibonacci sequence = 144.