Let a, be the nth term of the sequence 1,-1, 1,-1, ..., then find an + an+1
n+1
Answers
Answered by
1
Answer:
r = -1 , a = 1
an = a^n-1
an+1 = a^n
an + an+1 = a r^n-1 + a r^n
= 1 (-1)^n-1 + 1 (-1)^n
= (-1)^n [ (-1)^-1 + 1]
= (-1)^n [ -1 + 1 ]
= 0
Step-by-step explanation:
Similar questions