Which number does not match the pattern in the sequence 13, 21, 34, 55, 90
90
Check whether each term is the sum of the two terms before it (a Fibonacci-type series).
13 + 21 = 34, which matches the third term.
21 + 34 = 55, which matches the fourth term.
34 + 55 = 89, but the series shows 90.
So the term that breaks the pattern is 90; it should be 89.
Hence, the number that does not match is 90.
Similar Questions
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