Machine Input Output Reverse Calculation

CMAT 2021 · Logical Reasoning · Hard · Input Output

Using the same Step rules (k→k2→k2+k→k2+k+5→k2+k+3k \to k^2 \to k^2+k \to k^2+k+5 \to k^2+k+3), what is the input if the following is the arrangement of Step IV? 9, 75, 113, 213, 33, 5

  1. A.

    2, 10, 8, 14, 5, 3

  2. B.

    2, 10, 8, 13, 5, 1

  3. C.

    2, 8, 10, 14, 5, 1

  4. D.

    3, 8, 9, 13, 5, 1

Answer

C

Explanation

Equation for each term: k2+k+3=Step IV valuek^2 + k + 3 = \text{Step IV value}. For 9: k2+k+3=9  ⟹  k2+k−6=0  ⟹  k=2k^2 + k + 3 = 9 \implies k^2 + k - 6 = 0 \implies k = 2. For 75: k2+k+3=75  ⟹  k2+k−72=0  ⟹  k=8k^2 + k + 3 = 75 \implies k^2 + k - 72 = 0 \implies k = 8. For 113: k2+k+3=113  ⟹  k2+k−110=0  ⟹  k=10k^2 + k + 3 = 113 \implies k^2 + k - 110 = 0 \implies k = 10. For 213: k2+k+3=213  ⟹  k2+k−210=0  ⟹  k=14k^2 + k + 3 = 213 \implies k^2 + k - 210 = 0 \implies k = 14. For 33: k2+k+3=33  ⟹  k2+k−30=0  ⟹  k=5k^2 + k + 3 = 33 \implies k^2 + k - 30 = 0 \implies k = 5. For 5: k2+k+3=5  ⟹  k2+k−2=0  ⟹  k=1k^2 + k + 3 = 5 \implies k^2 + k - 2 = 0 \implies k = 1. Input = 2, 8, 10, 14, 5, 1.

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