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Let A 1 , A 2 , A 3 , … be an increasing geometric progression of positive real numbers. If A 1 A 3 A 5 A 7 = 1296 1 and A 2 + A 4 = 36 7 , then, the value of A 6 + A 8 + A 10 is equal to

1. 33
2. 37
3. 43
4. 47

Correct answer: 43

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