11 + 11 = 4 , 12 + 12 = 19 and 13 + 13 = ?
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0
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I hope it will help you. ...
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2
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=> (1+ 1) x (1+ 1)
=> 2 x 2 = 4
=> (1+ 2) x (1+ 2)
=> 3 x 3 = 9
now
=> (1+3) x (1+ 3)
=> 4 x 4 = 16 ans
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