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`a`, `b`, `c`, `d` are in increasing `G.P.` If the `AM` between `a` and `b` is `6` and the `AM` between `c` and `d` is `54`, then the `AM` of `a` and `b` isA. `15`B. `48`C. `44`D. `42` |
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Answer» Correct Answer - D `(d)` Let `r` is the common ratio. `implies(a+ar)/(2)=6` and `(ar^(2)+ar^(3))/(2)=54` `impliesr^(2)=9impliesr=+-3impliesr=3(r ne -3)` When `r=3`, `a=3, `AM` of `a` and `d=(a+ar^(3))/(2)=42` |
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