Answers

2014-01-27T15:59:20+05:30
4+44+444+....... upto n terms.
4(1+11+111+........upto n terms)
4/9(9+99+999+.........upto n terms)
4/9[(10-1)+(10²-1)+...... upto n terms]
4/9[10+
10²+.........+10ⁿ}-(1+1+1+....n times)]
(4/9) { 10 [ ( 10ⁿ - 1 ) / ( 10 - 1 ) ] - n(1) }
(4/9) [ (10/9) ( 10ⁿ - 1 ) - n ]...................
1 5 1
[10+10²+.........+10ⁿ} forms gp
and sum of gp is: rⁿ-1/r-1, where r is first term of gp
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