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Question

Find the missing value (13)3+73(13)2+72−?=20

A
6
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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)2x=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

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