15
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The next number in the sequence is 15 - the sequence goes x2, +2, -1
15
15 + 1 = 16 sum 15 - 1 = 14 difference
This is a three step sequence of operations. (1) -4 : (2) ÷3 : (3) x2 46 - 4 = 42 : 42 ÷ 3 = 14 : 14 x 2 = 28 28 - 4 = 24 : 24 ÷ 3 = 8 : 8 x 2 = 16 The next number is therefore 16 - 4 = 12.
1 .... - 1, 1+4(square of 2) - 5, 1+4+9(square of 3) - 14, 1+4+9+16(square of 4) - 30, 1+4+9+16+25(sqaure of 5)- 55,