The 11th term and the 21st term of an A.P. are 16 and 30 respectively, then find the 16th term of that A.P.
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Answer:
a+10d=16, a+20d=30
a+10d=16
a+20d=30
-. -. -
-10d.=-14
d= 7/5
then,=a+ 10×7/5=16
= a+ 14 =16
a= 2
so a+15d is 16th term
= 2+15×7/5
=23
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