Question

Which term of an ap 171,167,163... Is its first negative term

Answer 1

Answer:

An<0

a=171

d=-4

a+(n-1)d<0

171+(n-1)(-4)<0

171-4n+4<0

175-4n<0

175<4n

175/4<n

43.75<0

so 43 term is the first negative term.