మీకు తెలుసా?

Letters A, B, C and D do not appear anywhere in the spellings of 1 to 99.
Letter D comes for the first time in 100 (Hundred)

Letters A, B and C do not appear anywhere in the spellings of 1 to 999.
Letter A comes for the first time in 1000(Thousand)

Letters B and C do not appear anywhere in the spellings of 1 to 999,999,999.
Letter B comes for the first time in 1,000,000,000 (Billion)

And  Letter C does not appear anywhere in the spellings of entire English Counting.