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The logic is: 
84 x 13 = 8 (8 +4) – (1+3) = 12-4 =8 
37 x 13 =6 (3+ 7) – (1+3) = 10-4 =6 
26 x 11 =6 (2+ 6) – (1+1) = 8 -2 = 6 Similarly, 
56 x 22 = ? (5 + 6) – (2+2) = 11-4 =7 Hence ‘7’ is the correct answer
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