Question 1172467
a7=a1+d(n-1)=a1+d(6)=17, so a1+6d=17
a13=a1+d(12), so a1+12d=29.
d=2
-
a1+12=17a1=5, which is the answer.
-
the difference is 2, so 6 more terms to a7 is 5+12=17