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Q: What is the number sequence 1 8 2 16 4?

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16

You are multiplying each number in the sequence by -2. Therefore, the next number in the sequence after 32 is -64.

The next number in the sequence is 15 - the sequence goes x2, +2, -1

16

The next number in the sequence 2, 4, 16, 64 is 256.

consecutive multiplying by 2.

If you mean: 1, 2, 4, 8 and 16 then the next number is 32

This is a 4 step sequence , starting with the number 1. 1) Double the number 2) Add 2 3) Subtract 1 4) Return to step 1) and repeat. 1 x 2 = 2 ; 2 + 2 = 4 ; 4 - 1 = 3 ; ..........7 x 2 = 14 ; 14 + 2 = 16. Then the next number is generated by Step 3).. 16 - 1 = 15

x 2 + 2 - 1 is the repeating sequence 1 x 2 = 2 2 + 2 = 4 4 - 1 = 3 3 x 2 = 6 6 + 2 = 8 8 - 1 = 7 7 x 2 = 14 14 + 2 = 16 16 - 1 = 15 the next number is 15

Each number is twice the previous number.

15,30,32,31,62,64,63..... (*2,+2,-1)

c) 17

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