In a sequence, each term after the second is the sum of the two preceding terms. The first and fifth terms are each 3. What is the second term in the sequence?
Let b be the second term....so we have.....
3, b, 3 + b, 3 + 2b, 6 + 3b
And the last term is equal to 3 ...so.....
6 + 3b = 3
3b = -3 → b = -1
And ths series is :
3, -1, 2, 1, 3