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Let a 1 , a 2 , ……, a 30 be an A.P., S = ∑ = 30 1 i i a and T = ∑ = 15 1 i ) 1 – i 2 ( a . If a 5 = 27 and S – 2T = 75, then a 10 is equal to :

1. 47
2. 42
3. 52
4. 57

Correct answer: 52

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