Question

which term of AP 19, 18.20, 17.40,.......is 1st negative term

Answer 1

hey dear sweet friend here is your answer

a=19

d=18.2-19

d= -0.8

formula is tn = a+(n-1)d

tn= 19+(n-1)-0.8

=> 19+(-0.8n+0.8)

=> -0.8n+19+0.8

=> -0.8n+19.8

is your answer