aritmetic an=a1+d(n-1) a1=first term d=common differnce
common differnce is a term minus pervious term 24-13=11 d=11 a1=first term=13
13+11(n-1) the nth term 299=13+11(n-1) solve distribute 299=13+11n-11 299=11n+2 minus 2 both sides 297=11n divide both sides by 11 27=n it is the 27th term
