find the middle term of the AP 6 13 20 ................216

1.	find the middle term of the AP 6 13 20 ................216
Answer» a=6, d=7an= a+(n-1)×d216=6+(n-1)x7216=6+7n-7216=-1+7n217 = 7nn= 217/7n= 31total no. of terms = 31middle term=1/2 × (31+1) = 1/2 × 32 = 16tha16 = 6+(16-1)×7 = 6+15×7 = 6+105 111

Discussion