CBSE Class 11-science Answered
7th sum

Asked by lovemaan5500 | 02 Feb, 2019, 08:26: PM
Let a be the first term and d be the common difference of an AP.
tp = a + (p - 1)d
tq = a + (q - 1)d
tr = a + (r - 1)d
According to the question terms are in GP
[a + (q - 1)d]2 = [a + (p - 1)d][a + (r - 1)d]
simplifying this we get
a =
and r = 


Solving r = 

we get r = 

Answered by Sneha shidid | 04 Feb, 2019, 01:04: PM
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