Sequences and series

neither do i understand the question nor the solution.
someone please help me with this
will post soln later

Kya h ye??? Which chap it belongs to??

Post the soln pls

sequences and series

Anyone understand the solution???

The number 999…9 can be written as 10^n-1.
Now if we divide that by 9, we have 111…1, now if we multiply that by 6 we have 666…6, number of digits won’t change this way. Hence we can proceed with the required operations in those numbers.

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