CBSE Class 10 Answered
athematic progression
Asked by | 22 Dec, 2009, 02:45: PM
Expert Answer
1/ We can find the common difference = second term - first term = q-p
Last term = p + (n-1)d = p + (n-1)(q-p) = 2p
Hence n = q/(q-p)
Sum = n(first term + last term)/2 = q(p + 2p)/(q-p) = 3pq/(q-p)
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Answered by | 22 Dec, 2009, 03:44: PM
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