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$90, 180, 12, 50, 100, 200,$______ $, 3, 50, 4, 25, 2, 6, 30, 3$
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The series is

$T_i = T_{n-i-1} \times T_{n-i-2}$

i.e., First term is the multiple of last two terms and so on. So,

$T_7 = T_8 \times T_9 = 3 \times 50 = 150.$
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