CBSE Class 10 Answered
find the 3 numbers in geomatric progression if
Asked by | 29 Sep, 2008, 06:38: PM
Expert Answer
let the no. be a/r,a,ar
then a(1+r+1/r) = 28....(1)
and a3 = 512 ==> a=8
solving (1) for the value of r
2r+2+2r2 = 7r
2r2 -5r +2 =0
r=2 or 1/2
so the no's are 16,8,4 or 4,8,16
Answered by | 30 Sep, 2008, 09:28: AM
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