What is the nth term formula of 100 89 78 67?

Answer 1

clearly the given series is an arithmetic progression with a common difference of -11,that is every term is obtained by subtracting 11 from the previous term

for any A.P, n-th term is

a(n)=a(1)+ (n-1)d

where a(1)=first term and d=common difference

here a(1)=100, and d= -11

so,

a(n)=100+(n-1)x(-11)

or, a(n)=111-11n