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# Logical Reasoning :: Flow Chart

Home > Logical Reasoning > Flow Chart > Discussion

## 5. Study the flow chart give below and the questions that follow. The purpose of the following chart is to double the number in each of the boxes 2, 4, 6, 8 and 10. In order to accomplish exactly this - no more and no less - What is the smallest number Which may be in box 1 ?

Explanation :

Assume [Box 1]= 19

Instruction 1: 2[Box 2] 2[Box 2] = 4[Box 2​]

Instruction 2: [Box 2] 2 = [Box 4] // increase box num from 2 to 4.

Instruction 3: IS [Box 1] 19 < [Box 2] 4  NO

Instruction 1: 4[Box 4] 4[Box 4] = 8[Box 4​]

Instruction 2: [Box 4] 2 = [Box 6]

Instruction 3: IS [Box 1] 19 < [Box 4] 8  NO

Instruction 1: 6[Box 6] 6[Box 6] = 12[Box 6]

Instruction 2: [Box 6] 2 = [Box 8]

Instruction 3: IS [Box 1] 19 < [Box 6]12  NO

Instruction 1: 8[Box 8] 8[Box 8] = 16[Box 8​]

Instruction 2: [Box 8] 2 = [Box 10]

Instruction 3: IS [Box 1] 19 < [Box 8]16  NO

Instruction 1: 10[Box 10] 10[Box 10] = 20[Box 10​]

Instruction 2: [Box 10] 2 = [Box 12]

Instruction 3: IS [Box 1] 19 < [Box 10] 20  YES

END

SO the ans should be 19//option A

// If you put [Box 1] = 9 then instruction end @ Instruction 3: IS [Box 1] 9 < [Box 6]12  Yes

//  If you put [Box 1] = 11 then instruction end @ Instruction 3: IS [Box 1] 11 < [Box 6]12  Yes

// If you put [Box 1] = 15 then instruction end @ Instruction 3: IS [Box 1] 15 < [Box 8]16  Yes

As per mention above we have to double 2,4,6,8,10 value...so loop never ends before updating upto

[Box 10] thats why our ans become 19

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