Find S10 for -1 + -7 + -13 + -19 +…
Solution:-
We know S =
![\[ \frac{n}{2}[2a_{1}+(n-1)d]\]](https://mymathangels.com/wp-content/ql-cache/quicklatex.com-5974ef85ead6cc8abe8782cf7fc21ca0_l3.png "Rendered by QuickLaTeX.com")
, Where a1 = first term , n = finding term , d = second term – first term.
S10 = ![\frac{10}{2}[2*(-1)+(10-1)(-6)]](https://mymathangels.com/wp-content/ql-cache/quicklatex.com-33c3eab22a01c612094d79228bb312ae_l3.png "Rendered by QuickLaTeX.com")
S10 = -280
So the value of S10 is -280
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