ICSE Class 10 Answered
the sum of first 6 terms of an A.P is 63 .The ratio of the 10th term to the 20th term is 1:2 . calculate the first and the 15th terms
Asked by savithakotari962 | 08 Feb, 2021, 20:40: PM
![S subscript 6 equals 63
6 over 2 open square brackets 2 a plus 5 d close square brackets equals 63
2 a plus 5 d equals 21 minus negative negative negative negative negative negative negative left parenthesis 1 right parenthesis
a subscript 10 over a subscript 20 equals fraction numerator a plus 9 d over denominator a plus 19 d end fraction
1 half equals fraction numerator a plus 9 d over denominator a plus 19 d end fraction
a plus 19 d equals 2 a plus 18 d
a equals d
P u t t i n g space t h i s space i s space e q u a t i o n space left parenthesis 1 right parenthesis
7 d equals 21
d equals 3
a l s o space a equals 3
15 t h space t e r m space i s space g i v e n space b y
a subscript 15 equals a plus 14 d
equals 3 plus 14 space x space 3
equals 45](https://images.topperlearning.com/topper/tinymce/cache/ee6db9822488b36c55011b83b7ed5c89.png)
Answered by Utkarsh Lokhande | 17 Feb, 2021, 10:15: AM
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