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B
20
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C
91
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D
19
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Solution
The correct option is C 91 (13)3+(7)3(13)2+(7)2−x=20 Let missing no is x Or 2197+343169+49+x=20 Or 2540218+x=20 Or 4360-20x=2540 Or -20x=2540-4360=-1820 Or x=91