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Q.

If log72=m, then log4928 is equal to

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a

1+2m2

b

1+m

c

2(1+2m)

d

21+2m

answer is B.

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Detailed Solution

log4928=log 28log 49=log 7+log 42 log 7

=log 72 log 7+log 42 log 7=12+12 log74

=12+12.2 log72=12+log72=12+m=1+2m2

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