Question

n-1,n-2,n-3....is an a.p then tn​

Answer 1

Step-by-step explanation:

tn=n-1+(n-1)(n-2-n+1)

n-1+(n-1)(-1)

tn=n-1-n+1

tn=0

Answer 2

Answer:

0

Step-by-step explanation:

a=n-1

d=-1

but we know that

Tn=a+(n-1)d

=>Tn=n-1+(n-1)(-1)

n-1-n+1. ( By opening the bracket)

=>Tn=0