Question

find the middle term of the A.P 6 ,13, 20 ,----- 216​

Answer 1

Answer:

a = 6 , d = 7 , An = 216

An = a+(n-1)d

216 = 6 + ( n-1) 7

210/7 = n-1

n = 30 + 1 = 31

Middle term = n+1/2 = 31+1/2 = 16

A16 = 6 + ( 16 - 1) 7

A16 = 6 + 105

A16 = 111

Step-by-step explanation:

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Answer 2

Answer:

111

Step-by-step explanation:

a=6

d=7

nth term=216

nth term=a+(n-1)d

6+(n-1)7=216

(n-1)=30

n=31

so total number of terms=31

number of terms is odd so middle term is(n+1/2)th term..

middle term=16th term

a+15d=6+15×7=111...

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