-1,-2,+2,-4,+4,-5,+5, +0. the sequence is subtract twice, add once, subtract again, add, then subtract, then add twice.
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The 40th number in the sequence will be 40 x 4, or 160.Reasoning:Because the sequence is multiples of 4.The 1st number in the sequence is 1 x 4, or 4.The 2nd number in the sequence is 2 x 4, or 8...The 4th number in the sequence is 4 x 4, or 16...The 17th number in the sequence is 17 x 4, or 68
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
16
times 8, divided by 4
27