If log10 2 = 0.3010; log10 3 = 0.4771 and log10 7 = 0.8451 then find log10 105?
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given, If log10 2 = 0.3010; log10 3 = 0.4771 and log10 7 = 0.8451.
we have to find value of log10 105.
we know, log_a(xyz)=log_ax+log_ay+log_azlog
a
(xyz)=log
a
x+log
a
y+log
a
z
so, log10 (105) = log10 (3 × 5 × 7)
= log10 3 + log10 5 + log10 7
now putting value of
log10 3 = 0.4771
log10 7 = 0.8451
log10 5 = ? so, we can write log10 5 = log10 (10/2)
[ formula, log_a(x/y)=log_ax-log_aylog
a
(x/y)=log
a
x−log
a
y
so, log10 5 = log10 (10) - log10 2
= 1 - log10 2 [ we know, log10 10 = 1]
= 1 - 0.3010
= 0.6990
now, log10 105 = 0.4771 + 0.6990 + 0.8451
= 2.0212
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