Find the missing term in the following series.
cba, cbaa, cbbaa, ?, ccbbaaa, ccbbbaaa

Solution

In each step one letter is added, in turn an a, then a b, then a c, and the cycle repeats. After cbbaa (one c, two b, two a) comes the extra c, giving ccbbaa. The next terms ccbbaaa and ccbbbaaa then follow the same cycle.

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Find the missing term in the following series.cba, cbaa, cbbaa, ?, ccbbaaa, ccbbbaaa