Question
Fri November 09, 2012 By:

The 4th term of an AP is 14 and it's 12th is 17,what is the 1st term

Expert Reply
Fri November 09, 2012
Let us say the first term is a and
the common difference is d
 
So, nth term will be an=a+(n-1)d
 
4th term = a+3d=14
 
12th term = a+11d=17
 
Subtracting we get
 
8d=3
 
d=3/8
 
hence a = 14- 3x3/8 = 112-9 / 8 = 103/8
 
this is the first term
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