what is the 6th term of 1,3,15,61,213

Question

seqeunce i n eed to knw the answer

Answer 1

You cannot solve this sequence without previous two sequences in the same test. Look for a difference between corresponding sequence members of C and D sequences to figure this out. =)

Answer 2

3^n -n^2 - n

Answer 3

687 for nth term: 3^n-n^2-n

Answer 4

3n – n(n+1) its three sqaured by n

Answer 5

an = 3n - n2 - n 

 

Answer 6

591 is the 6th term.

Formula for nth term is 1-7n+15n²-8n³+2n⁴, where n≥0, so the first term is when n=0. The 6th term is when n=5. This formula gives 1363 as the 7th term.

Other formulas may also work because only a few terms have been given. These other formulas are likely to predict a different 6th term.