QueenThao5031 QueenThao5031
  • 23-01-2024
  • Mathematics
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Let a1 = 8, a2, a3, …. an be an A.P. If the sum of its first four terms is 50 and the sum of its last four terms is 170, then the product of its middle two terms is _______.
A) 60
B) 64
C) 72
D) 80

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