Question

find tn of the A.p.4,9,14,....

Answer 1

Given
AP-    4,9,14........254
Last term of AP is 254
Since it is been asked to find the 10th term from end; a=254
d= -5 , n=10
an= a+(n-1)d
   an = 254+ (10-1)(-5)
  an= 254-45
an= 209

Answer 2

this image has the ans look and understand it well