Do you know,

Letters ‘a’, ‘b’, ‘c’ & ‘d’ do not appear anywhere in the spellings of 1 to

99

(Letter ‘d’ comes for the first time in Hundred)

Letters ‘a’, ‘b’ & ‘c’ do not appear anywhere in the spellings of 1 to 999

(Letter ‘a’ comes for the first time in Thousand)

Letters ‘b’ & ‘c’ do not appear anywhere in the spellings of 1 to

999,999,999

(Letter ‘b’ comes for the first time in Billion)

And

Letter ‘c’ does not appear anywhere in in the spellings of entire
English counting

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