3 years ago

Question 3o show all workFind the sum of2i 3(a 1+an

1 answer:

8 0

$n=8\\
a_1=2\cdot3+3=9\\
a_n=a_8=2\cdot10+3=23\\\\
\displaystyle
\sum\limits_{i=3}^{10}2i+3=S_8=\dfrac{8}{2}\cdot(9+23)=4\cdot32=128$

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