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ADNAN MUHAMMED

Grade 12,

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If a ,A1 , A2, A3 ....A10, b are in AP and and a, G1, G2, G3.... G10 b are in GP and H is the hm between a and b then A1 + A2 ....+A10/G1g10 + A2+A3....A9/G2G9 +.......A5A6/G5G6 is ....

If a ,A1 , A2, A3 ....A10, b are in AP and and  a, G1, G2, G3.... G10 b are in GP and H is the hm between a and b then A1 + A2 ....+A10/G1g10 + A2+A3....A9/G2G9 +.......A5A6/G5G6 is ....
 
 

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Grade:11

1 Answers

Reshma
15 Points
4 years ago
h=2ab/a+b
a+b=a1+a10=a2+a9=......=a5+a6='x'
ab=g1.g10=g2.g9=.......=g5.g6='y'
 
 
5x/y+4x/y+3x/y+2x/y+x/y
=15x/y
 
h=2y/x.      (x=a+b.     y=ab)
x/y=2/h
 
15x/y =30/h
 
Ans.  30/h

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