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The purpose of the following flow-chart is to put a zero in each of the boxes: 4, 5 and 6.
In order to accomplish exactly this -- no more and no less -- what number must be in box 11?
A8
B3
C7
D9
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STEP-BY-STEP
Instr 1: B4 = B1-B1 = 0
Instr 2: Change Instr 1 s.t B4 becomes B5
Instr 3: Is 5 == 7 NO Goto Instr 1
Instr 1: B5 = B1-B1 = 0
Instr 2: Change Instr 1 s.t B5 becomes B6
Instr 3: Is 6 == 7 NO Goto Instr 1
Instr 1: B6 = B1-B1 = 0
Instr 2: Change Instr 1 s.t B6 becomes B7
Instr 3: Is 7 == 7 YES
END
VALUE AT BOX 11 SHOULD BE 7.
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