Answers

2015-03-12T23:04:36+05:30
I think it is -24. U can check it before accepting it.
1 5 1
I needed the steps..the answer is right!
a13 - a14 = -6,i.e., the common difference. Similarly, a16 - a12 = -6*4 = -24. Hope this will help you.
Thank you !!
don't mention timmy.
2015-03-13T09:58:47+05:30
A₁₆ = a + ( n₋1)d
      = a+ ( 16₋1) -6
      =a -90 ........ 1
a₁₂ = a + (12-1) -6
      = a-66 .........2
sub 1 - 2⇒
      = a -90-a+66
      = -24
1 5 1