Application of DerivativeHard
Question
If a, a1, a2,......a10 , b are in A.P. and a, g1, g2......g10, b are in G.P. and h is the H.M. between a and b, then 
is -
is -Options
A.
B.
C.
D.
Solution
a1 + a10 = a2 + a9 = ...... = (a + b)
g1g10 = g2g9 = ...... = ab
⇒
= 15
g1g10 = g2g9 = ...... = ab
⇒
= 15
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