Question

11+11=4
12+12=9
13+13=?​

Answer 1

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15

Answer 2

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$\sf 11 = (1 + 1)^{2} = 2^{2} = 4$

$\sf 12 = (1 + 2)^{2} = 3^{2} = 9$

$\textbf{In \ same \ way}$

$\sf 13 = (1 + 3)^{2} = 4^{2} = 16$

$\rule{200}3$