QueenThao5031 QueenThao5031 23-01-2024 Mathematics contestada 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) 60B) 64C) 72D) 80