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Hard Number Series Riddle

Hard Number Series Riddle Solution - 8 May

Find the next number in the series

21 32 54 87 131 ?

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Solution
186

21+11*1 => 32
32+11*2 => 54
54+11*3 => 87
87+11*4 => 131
131+11*5 => 186 (answer)