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CBSE Class 10 Answered

  If the ratio between 5th and 10th terms of an AP is 1:2 and 12 the term is 36.find the AP
Asked by asumangalashetty | 11 Jan, 2019, 10:41: PM
answered-by-expert Expert Answer
let a be the first term and d be the common difference of A.P.
 
begin mathsize 12px style t subscript 5 over t subscript 10 equals fraction numerator a plus 4 d over denominator a plus 9 d end fraction equals 1 half space space space o r space 2 a plus 8 d space equals space a plus 9 d space space space space o r space space a space equals space d

end style
t12 = a+11d = 12d = 36  or a=d=3
hence first term of A.P is 3 and common difference of A.P. is also 3
Answered by Thiyagarajan K | 11 Jan, 2019, 11:13: PM
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