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22-02-2024
Mathematics

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Let a₁,a₂,a₃⋯,a₂₁ be an AP such that
20
∑ 1/aₙaₙ₊₁ =4/9
n=1
If the sum of this AP is 189, then a₆a₁₆ is equal to:
A. 36
B. 57
C. 72
D. 48

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