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Q.

If pth,qth,rth terms of a G.P are a,b,c then (q-r)log a=

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a

0

b

1

c

pqr

d

abc

answer is A.

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Detailed Solution

a=Rp-1  b=Rq-1  c=Rr-1 where first term in 1

log a=p-1 log R,  log b=(q-1) log R log c=(r-1) log R  (q-r) log a=(q-r) (p-1) log R+(r-p) (q-1) log R       =log R (qp-q-rp+r+rq-r-pq+p+rp-rq-p+q)       =0

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