32=9
9-5=4
4+1=5
52=25
25-5=20
20+1=21
212=441
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22
Arithmetic
20, 21, 22, 24, 25
436 is the best choice for the next number in the sequence because:3x3=9-5=45x5=25-5=2021x21=441-5=436The Pattern: Square the term, then take away 5, add one, and square it again, and so on.
20, 21, 22, 24, 25