A letter series is given below in which some letters are missing. Select the option that gives the letters that can fill these blanks in that order.
a_ca_bab_ad_abc_db
Total 18 letters are there in the series divide it in 3 equal group and fiil the gap with the given option one by one and check the sequence.
Option B and D we will not check because it have letter 'e' and series doesn't have letter 'e'.Â
If we fill the gap by option A then it will complete the series
abcadb     abcadb    abcadb
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