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A= 6-5=1
U51= a+(n-1)b
1+(51-1)5=1+50x5=256
= a+6b =31 -
- 5b= - 25 ⇒ b = 5
a+b = 6
a+5 = 6 ⇒ a = 1
= a+50b = 1 + 50(5) = 251