Question

Find the middle term of the AP
9; 13; 17; ...; 209.​

Answer 1

Answer:

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Answer 2

a = 9 , d = 4 , an =209

an = a + (n - 1) d

209 = 9 + (  n- 1) 4

209 = 9 + 4n - 4

209 = 5 + 4n

204 = 4n

4n = 204

n = 204 / 4

n= 51

middle term = 51 + 1/ 2

HENCE MIDDLE TERM = 26

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