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ICSE Class 10 Answered

Find the A.P.whose nth terms 7-3n. also find the 20th term  Find the 8th term of the ap whose first term is 7 and common differenceis 3  
Asked by Kumarat74 | 13 Aug, 2018, 06:44: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight a subscript straight n equals 7 minus 3 straight n
straight a subscript 10 equals 7 minus 3 cross times 10 equals negative 23

straight a subscript straight n equals straight a plus left parenthesis straight n minus 1 right parenthesis straight d
straight a subscript 8 equals 7 plus left parenthesis 8 minus 1 right parenthesis cross times 3 equals 28 end style
Answered by Arun | 13 Aug, 2018, 12:41: PM
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