find S5 of SO.8,6,4
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Step-by-step explanation:Answer: s5 =20
Step-by-step explanation: AP 8,6,4
a=8 d= 6-8 = - 2
s5= n/2{2a+(n-1)d}
= 5/2{16+(5-1)(-2)}
= 5/2{8}
= 5*4
= 20
hope it will help
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