If the sixth term of an arithmetic sequence is 5 and the sum of the third term and the eighth term is 5, then the fifth term of the arithmetic sequence is 5

Simple:
Use this formula if M + n = P + Q (diagonal formula)
Then am + an = AP + AQ
Because 3 + 8 = 5 + 6
So A3 + A8 = A6 + A5
5=5+a5
So A5 = 0
Item 5 is 0

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