NDA2015MathematicsSequences and SeriesActual
If p , q , r are in one geometric progression and a , b , c are in another geometric progression, then ap, bq, cr are in
Options
- AArithmetic progression
- BGeometric progression
- CHarmonic progression
- DNone of the above
Correct answer
B. Geometric progression
Step-by-step solution
Let the common ratio be K ₁ for p , q and r . aligned & q = K ₁ p & & r = ( K ₁ )^2 p aligned Let the common ratio be K ₂ for a , b and c aligned & b = K ₂ a & & c = ( K ₂ )^2 a & bq = ( K ₁ ~K ₂ ) ap & & Cr = ( K ₁ ~K ₂ )^2 ap aligned So ap, bq, cr are in G.P.