Question

Find the indicated terms in the given sequence whose nth is an = (-1)n 2 n+3(n+1) ; a4, a7​

Answer 1

Answer:

The nth term of the sequence is

an=(−1)nn....eq(1)

1) To find the third term of sequence (a3)  put n=3 in eq(1)

⟹a3=(−1)3×3

⟹a3=−1×1

⟹a3=−3

2)To find the fifth term of seqence (a5) put n=5 in eq(1)

⟹a5=(−1)5×5

⟹a5=−1×5

⟹a5=−5

3)To find the eighth term of sequence (a8) put n=8 in eq(1)

⟹a8=(−1)8×8

⟹a8=1×8

⟹a8=8