Question
Which letter number cluster will replace the question
mark (?) to complete the given series? C12, F15, I60, L65, O390, [?]Solution
C + 3 = F, F + 3 = I, I + 3 = L, L + 3 = O, O + 3 = R For number, 12 + 3 = 15, 15 x 4 = 60, 60 + 5 = 65, 65 x 6 = 390
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