Twenty pieces of wood have lengths in an AP. The shortest is 5cm the length of the piece is 480cm
A) what is the length of the longest piece.
In the AP the sum of the first 11 terms equals the sum of the first 20 terms. Given that the 5th term is 33
B) find the sum of the first 31 terms.
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20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20=480
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