The total number of toothpicks also forms a sequence: 4, 12, 24, 40, ... What rule describes this sequence?
1 answer:
<span> rule describes this sequence is </span><span> an = 2 ( n^2 + n ) n = 1 </span> an = 2 ( 1^2 + 1 ) an = 2 ( 1 + 1 ) an = 2 ( 2 ) an = 4 n = 2 an = 2 ( 2^2 + 2 ) an = 2 ( 4 + 2 ) an = 2 ( 6 ) an = 12 n = 3 an = 2 ( 3^2 + 3 ) an = 2 ( 9 + 3 ) an = 2 ( 12 ) an = 24 n = 4 an = 2 ( 4^2 + 4 ) an = 2 ( 16 + 4 ) an = 2 ( 20 ) an = 40
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