Find the value of n so that 
may be the geometric mean between a and b.
G.M of two numbers in G.P. is given by √ab
∴ 
= √ab
By squaring on both sides we get,
⇒ 
= ab
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 2n+1 = 0
⇒ 2n = –1
⇒ n = 
∴ Value of n for 
to be G.M is 
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