×?°السلام عليكم ورحمة الله وبركاته×?°
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 the spellings of entire English counting

I hope u like my topic.....