Question

The nth term of an arithmetic sequence is an = 5 – 6n. Finditssumofnterms

Answer 1

Step-by-step explanation:

given: tn = 5 - 6n

put n=1 ,t1= -1

n= 2, t2= -7

n =3,t3= -13

sum of n terms= n/2[2a+(n-1)]

= n