Question

find the middle term of Ap:6,13,20,.....216

Answer 1

a= 6
d= 7
last no = 216

216 = a+(n-1)d
216 = 6+(n-1)7
216 = 6+7n-7
216 = 7n-1
216 + 1 = 7n
217 = 7n

n = 31

therefore no of terms are 31
so the mid term will be 31+ 1 / 2
                                     = 32/2
                                     = 16th term

16th term = a+15d
                 = 6 + 15*7
                 = 6 + 105
                 = 111

the middle no is 111 which is the 16th term . 

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Answer 2

Answer:

refer the above attachment.Hope it helps u.