Question

which term of an ap 17,14,-11...is -43

Answer 1

just subs the given in formula

Answer 2

The correct answer will be "n=21".

Step-by-step explanation:

$The \ given \ series \ is:\\17,14,-11...\\First \ term,a,a_{1}=17\\ Second \ term,a_{2}=14 \\Difference,d=a_{2}-a_{1}=14-17=-3\\ a_{n}=-43\\As \ we \ known=\\a_{n}=a+(n-1)d\\On \ putting \ the \ values \ in \ the \ above \ formula,we \ get\\-43=17+(n-1)-3\\-43=17-3n+3\\-43=20-3n\\On \ subtracting \ "20" \ from \ both \ sides,we \ get\\-43-20=20-3n-20\\-63=-3n\\n=\frac{-63}{-3}\\ n=21$

Learn more:

https://brainly.in/question/13696516