--aba-ba-ab

In each of the following letter series, some which are given in that order of the letters are missing which are give in the that order as one of the alternative below it. Choose the correct alternative. - - aba - - ba - ab 1) abbba 2) abbab 3) baabb 4) babba 5) None of these

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it. aba_baca_ba_bacaabac _aca

The product of a and b is added to their sum is written as ab+a+b(b)a+b-aba+ab (d) a+ab-b

bar(ab)-bar(ba) is exactly divisible by 9

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it. a _ _ babba _ bb a_ba

Prove that: (log_a(log_ba))/(log_b(log_ab))=-log_ab

ab __ ba ___ ba ___