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the 13th term of ap is 2times of 10th term and 3rd term is 6times its 6th term find sum of first three terms |
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Answer» Answer: 13 term MEANS a+ 12d ...(1) and 10 term means a+9d. ....(2) from given condition a+12d=2×(a+9d) a+12d=2a+18d a-2a+12d-18d=0 -a -6d=0.....(3) -a=6d multipleying by 5 -5a=30d....(4) from second condition a+2d=6(a+5d) a+2d=6a+30d a-6a+2d-30d=0 -5a -28d=0 from 4 30d-28d=0 2d=0 d=0 please mark me as a brainlist and follow me |
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