If the ratio of the sums of 10 and 5 terms of an arithmetic series is 4:1, then the ratio of it's 10th and the 5th term is :
1. 18:7 3. 9:7
2. 19:7 4. 19:11
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1) 8:2 2)8:2 3)3:2 4)7:4
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