the third term of an arithmetic sequence is 9 and 10th term is 23 write its 20th term
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Step-by-step explanation:
a+2d= 9
a+9d= 23
-7d= -14
d= 14/7= 2
a+2×(2)= 9
a= 5
t20= a+19d
= 5+19×2
= 5+38
= 43..
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