7+77+777+......to infinity find sum
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not possible up to infinity
n terms could be possible
7(1+11+111+.....n terms)
divide and multiply by 9
7/9(9+99+999+.....n terms)
7/9((10-1)+(100-1)+(1000-1).....n terms)
7/9(10+10^2 +10^3 +10^4........-(1+1+1...upto n))
7/9(sum of gp -n)
after that apply gp formula for n terms then u go ........hope it will help mark as a brainliest
n terms could be possible
7(1+11+111+.....n terms)
divide and multiply by 9
7/9(9+99+999+.....n terms)
7/9((10-1)+(100-1)+(1000-1).....n terms)
7/9(10+10^2 +10^3 +10^4........-(1+1+1...upto n))
7/9(sum of gp -n)
after that apply gp formula for n terms then u go ........hope it will help mark as a brainliest
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