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a bb ccc dddd eeeee .........What is the 120th letter?

a bb ccc dddd eeeee .........What is the 120th letter?






Answer: O



Explanation:
Number of letters in each term are in AP. 1, 2, 3, ...
So n(n+1)2≤120
For n = 15, we get LHS = 120. So 15th letter in the alphabet is O. So 15th term contains 15 O's.

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