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tent
log 18 = log (3² x 2)
= 2log3 + 2log2
= 2 x 0.4771 + 0.3010
= 1.2552
log 21 = log (7 x 3)
=log 7 + log3
=0.8451 + 0.4771
=1.3222
log 10.5 =log 7 x 3 per 2
log 7 + log 3 - log 2
= 0.8451 + 0.47771 - 0.3010
=