Find the 21 term of the Ap -4 1/2,
-3 ,- 1 1/2 ...
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Answer:
86
Step-by-step explanation:
a=-4; d =1/2 -(-4) = 9/2;
21st term =a21 = a+20d ⇒ -4 + 20(9/2) =-4 +90 =86
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