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Let a1, a2,...,a30 be an AP, S=sum(i=1)^...

Let `a_1, a_2,...,a_30` be an AP, `S=sum_(i=1)^(30)a_i` and `T=sum_(i=1)^(15)a_(2i-1)` If `a_5=27` and `S-2T=75` then `a_10` is equal to
(a) 57
(b) 42
(c) 52
(d) 47

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