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how do you figure out the pattern of 1,4,9,16?

4 answers

1 + 3 = 4
4 + 5 = 9
9 + 7 = 16

16 + ____ = 25

Do you see the pattern?

16+9=25

Answer is 9

how about
1^2 = 1
2^2 = 4
3^2 = 9
4^2 = 16
etc

Ahh -- thank you, Reiny. I didn't think of squares.

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