How many term of AP 17,15,13, 11 whose n th term is -47

1.	How many term of AP 17,15,13, 11 whose n th term is -47
Answer» a=17, d=-2,an=a+(n-1)d___-47=17+(n-1)(-2)___-47=17-2n+2___-47=19-2n___-47-19=-2n___-66=-2n___n=33 How we solve linear equation

Discussion