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Let a 1 , a 2 , a 3 , ………, a 49 be in A.P. such that ∑ = + = 12 0 1 4 416 k k a and a 9 + a 43 = 66. If 140 ...... 2 17 2 2 2 1 = + + + a a a m, then m is equal to :

1. 66
2. 68
3. 34
4. 33

Correct answer: 34

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