Question

find the first four terms of the sequence whose nth terms are given by 1.(-1)n+1n(n+1)​

Answer 1

Step-by-step explanation:

t¹ = -1

t² = n+1

t³= 1n (n)

t⁴= n+1

Answer 2

Answer:

a1= 2

a2=-6

a3=12

a 4=-20