The pattern is +5, -7, +5, -7.
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3 is the answer
is this question number 10? 4n - 1 creates the pattern 3, 7, 11, 15, 19, etc.
It doesn't follow the pattern. 1 + 2 + 3 + 4 + 5 + 6 = 21
A regular decagon; A 20-gon with 2 lots of 10 congruent sides and angles in an alternating pattern; A 30-gon with 3 lots of 10 congruent sides and angles in an 1-2-3-1-2-3 pattern; A 40-gon with 4 lots of 10 congruent sides and angles in an 1-2-3-4-1-2-3-4 pattern; etc.
1.The exponents follow a pattern, with every other digit being a one:3^2 = 93^4 = 813^6 = 7293^8 = 6513^10 = 590493^12 = 531441etc.