Question 42189
Let us denote the first term by 't1', second term by 't2' and so on.


{{{t2/t1=(2/13)/(1/12)=24/13}}}


{{{t3/t2=(3/14)/(2/13)=39/28}}}


{{{t4/t3=(4/15)/(3/14)=56/45}}}


So, clearly, the numbers are not in G.P. or Geometric Progression as there is no common ratio.


Again,
{{{t2-t1=2/13-1/12=11/156}}}


{{{t3-t2=3/14-2/13=11/182}}}


{{{t4-t3=4/15-3/14=11/210}}}


So, clearly, the numbers are not in A.P. or Arithmetic Progression as there is no common difference.


Hence the numbers are neither in A.P. nor in G.P.