Question

Find a large number of 7 digits that are divided by 12, 15, and 21.

please answer correctly.​

Answer 1

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$12\:=\:2²\:×\:3$

$15\:=3\:×\:5$

$21=\:3×\:7$

$LCM \:of \:12,15,21\:=\:22×3×5×7\:=\:420$

$As\:we\:know\:that\:the\:Largest \:7 \:digit \:number \:is\: 9999999.$

$Therefore,\:9999999/420\:=\:23809.5214$

$Largest \:7 \:digit \:number \:divisible\: by\: 12,15\:and\:21 \:is \:23809×420\:=\:9999780$