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Solution

Correct Option: 4

Pattern: the middle (bottom) number equals (top number) times (side number) minus (top + side). For 4 and 7: 4×7(4+7)=2811=174\times 7-(4+7)=28-11=17. For 7 and 9: 7×9(7+9)=6316=477\times 9-(7+9)=63-16=47. For 11 and 12: 11×12(11+12)=13223=10911\times 12-(11+12)=132-23=109.

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