The sum of first six terms of an A.P. is 42.The ratio of its 10th term to its 30th term is 1:3. find the first term of the A.P.
prolita30ovuwfv:
1st term is 2. Common difference is also 2
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a=7....
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sis, it's given sum of 1st 6 terms, not the 6th term
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