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ICSE Class 10 Answered

Insert 6 arthemetic means between 15 and -15 ?
Asked by aashishchowdary143 | 18 Feb, 2019, 09:54: PM
answered-by-expert Expert Answer
If 6 arithmetic means are inserted between 15 and -15, there are 8 terms in A.P.
 
First term of A.P is 15.  8th term of A.P = t8 = 15+7d = -15 or  d = -30/7
 
Hence A.P  :   15,  [15-(30/7)], [15-(60/7)], [15-(90/7)], [15-(120/7)], [15- (150/7)],  [15-(180/7)],  -15
 
Hence A.P.  :  15,  75/7,  45/7,   15/7,   -15/7,   -45/7 , -75/7,  -15
Answered by Thiyagarajan K | 19 Feb, 2019, 11:58: PM

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