Question

which term of the sequence 20,77÷4,37÷2,71÷4.....is the first negative term?

Answer 1

for the first -ve term an<0
a+(n-1)d<0
22+(n-1)*-3/4<0
88-3(n-1)<0
88-3n+3<0
91<3n
91/3<n
30.33<n
since n can not be a -ve number so n=31