Find the sum of series 4+44+444+....... Upto 10th term
I want full process with formula as well
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Sn = n÷2(2a + (n-1)d)
=10÷2(2×4+(10-1)40)
=5(8+9×40)
=5(8+360)
=5(368)
=1840
=10÷2(2×4+(10-1)40)
=5(8+9×40)
=5(8+360)
=5(368)
=1840
Atul123hero:
How can you say that common difference of this series is 40
by a2 - a1
bcz in that qus there is no common difference
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