Select the combination of letters that when sequentially placed in the blanks will create a repetitive pattern.

a_bc_a_bcda_ccd_bcd_

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  1. a, a, b, c, c, d
  2. a, c, b, d, b, d
  3. a, d, b, b, a, d
  4. a, d, b, b, d, d

Answer (Detailed Solution Below)

Option 3 : a, d, b, b, a, d
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Detailed Solution

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Given :- a_bc_a_bcda_ccd_bcd_

By checking options and substituting accordingly.

1. a, a, b, c, c, d → b c a - a b c d - a c c d - b c d d

2. a, c, b, d, b, d → b c c - a b c d - a c c d - b c d d

3. a, d, b, b, a, d → b c d - a b c d - a c c d - b c d d

4. a, d, b, b, d, d → b c d - a b c d - a c c d - b c d d

    ♦  Option (3) gives a cyclic pattern of aabcd - abbcd - abccd - abcdd.

Hence, ‘a, d, b, b, a, d’ is the correct answer.

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