Which term of the ap 3,15,27,,39will be 120more than its 21st term
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2
Answer:
11th
Step-by-step explanation:
Total difference = (n-1) d
Here, total difference = 120
Common difference "d" = (15-3) = 13
120 = (n-1) 12
n-1 = 10 n = 11
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