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

1.	Find the middle term of the A.P:6,13,20.....216
Answer» Ap:6 13 20.....216\xa0a=6. d=7. an=216an=a+(n-1)d216=6+(n-1)7On solving\xa0n=31\xa0So middle term is 16th term\xa0a16=a+15d =6+15×7 =6+105=111

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