Question

please , can anyone tell me .​

Answer 1

9+99+999.....

(10-1)+(100-1)+(1000-1)......

(10-1)+(10²-1)+(10³-1).......(10¹⁰-1)

All the terms of 10 forms a GP

grouping all the terms of 10 and that of 1 we have,

(10+10²+10³+.......10¹⁰) - (10*1)

I think the answer to the question is option D