Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
a_b_aad_ca_dbc_adb_a
By Trial and Error method,
Option A
adbba | adcca | adbcc | adbaa
The above letters do not form a series. Hence option A is incorrect.
Option B
adbca | adbca | adbca | adbca
The above letters form a series.
Hence, the correct answer is Option B
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