Are you good at math?!

Question:

Complete the last two in this sequence: 1=3, 2=3, 3=5, 4=4, 5=4, 6=3, 7=5, 8=5, 9=4, 10=3, 11=?, 12=?

Answers:

11=6 12=6

There are 3 letters in 1, 3 letters in 2, 5 letters in 3 and so on.

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