Question
51, 60, 78, ?, 141,
186 What will come in place of the question mark (?) in the following series?Solution
51 + 9 × 1 = 60, 60 + 9 × 2 = 78, 78 + 9 × 3 = 105, 105 + 9 × 4 = 141, 141 + 9 × 5 = 186
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