648340021 is written with commas as (International System)
none of these
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In international system of numeration, The 1st period consists of - ones, tens and hundred. The 2nd period consists of - thousand, 10 thousand and 100 thousands. The 3rd period consists of - million, 10 million and 100 million. The 4th period consists of - billion, 10 billion and 100 billion. ∴648340021 is written with commas as (International System)= 648,340,021 Option A is correct.