Puzzle:11×11 = 4; 22×22 = 16; 33×33=?

Question:

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11×11 = 4;

22×22 = 16;

33×33= ?

Answer:

11×11 = 121,so 1+2+1 = 4
22×22=484,so 4+8+4 = 16
33×33=1089,so 1+0+8+9=18

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