The sum of three terms of a strictly increasing G.P is αS and the sum of the squares of these terms is S2, then if r=2 then the value of (α2) is (where (.) denotes the Least integer function and r is the common ratio of the Geometric progression. )
A
0
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B
1
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C
2
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D
3
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Solution
The correct option is D3 Let the three numbers in strictly increasing G.P are ar,a,ar(r>1)
According to the passage a2r2+a2+a2r2=S2
or a2(1r2+1+r2)=S2
Splitting as ⇒a2(1r+1+r)(1r−1+r)=S2 ....(1)
and ar+a+ar=αS
Squaring both sides, we geta2(1r+1+r)2=α2S2 .......(2)