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If a 1 , a 2 , a 3 ..... and b 1 , b 2 , b 3 ..... are A.P., and a 1 = 2, a 10 = 3, a 1 b 1 = 1 = a 10 b 10 , then a 4 b 4 is equal to-

1. 27 35
2. 1
3. 28 27
4. 27 28

Correct answer: 27 28

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