what is the sum of 9+99+999+.....+n
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Sn=(9+99+999+...+n)
=>(10+100+1000+..10^n)-n
=>Convert in GP form
Hope it works .
See pic for details
=>(10+100+1000+..10^n)-n
=>Convert in GP form
Hope it works .
See pic for details
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satpreetkaur:
i know it is a gp. i need to know the answer
See the picture
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