If a sequence has odd terms, the sum of odd terms is 81, and the sum of even terms is 72, then the sequence has several terms

If a sequence has odd terms, the sum of odd terms is 81, and the sum of even terms is 72, then the sequence has several terms

S odd-s even
=an-an-1+an-2-an-3+…… +a3-a2+a1
=d+d+d+d+…… +a1
=a1+(n-1)d/2
=81-72
=9
Sn=n[a1+(n-1)d/2]=81+72=153
9n=153
n=17

If there are 2n + 1 terms in the arithmetic sequence, the sum of all odd terms is 132, and the sum of even terms is 120, then n=
Finding the value of n

S odd-s even = a (n + 1) = a1 + nd s odd / s even = (n + 1) / N, the solution is n = 10

What are the odd and even terms in the double sequence, and what are the differences between them and the odd and even numbers

The odd term is the first, third, fifth Term, that is, the m-th term (M is an odd number), and even term is the 2, 4, 6 Term, that is, the nth term (n is even)