Brain
Teaser
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Ouch
Answer:
19
11x13=143 and (1+4+3+1=9)
13x15=195 and (1+9+5+1=16)
15x17= 255 and (2+5+5+1=13)
22x24=528 and (5+2+8+1=16)
27x29=783 and (7+8+3+1=19)
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