Question

Find the middle term of A.P 6,13,20,....................216

Answer 1

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Answer 2

an = a + ( n-1) d
216 = 6+ (n-1) 7
216-6 = (n-1)7
210 /7 = (n-1)
30 +1 = n
n= 31

Since the no.of terms are odd
Middle term = (n +1/2)th term
31+1/2 th

16th term
a16 = a+15d
a16 =6 + 15×7
a16 = 111