Question

Find the simplest pattern and insert the missing terms of the sequences. o, t, t, f, f, s, s, e, n, ...

Answer 1

O is one
T is two
T is three
F is four
F is five
S is six
S is seven
E is eight
N is nine
The next two terms
T for ten and e for eleven

Answer 2

The letters are the first letter of their corresponding numbers (one, two, three = o, t, t). This means that the next terms will be t, e, t, t, f, f, s, s, e, n, t and so on.