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Sagot :
aₙ=a₁+d(n-1)
aₙ= -20 + 1/2(n-1)
a₉= -20 + 1/2(9-1)
= -20 + 1/2(8)
= -20 + 4
= -16
Step-by-step explanation:
hope it's helpful to you
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