Question

Why is it wrong to express 10^6 km as Mkm ?

Answer 1

Answer:

because two prefixes cannot be written simultaneously .

Answer 2

Answer:

$10^6km$ cannot be represented as $Mkm$ because $2$ prefixes cannot be written simultaneously.

Explanation:

In $10^6 km$, kilo is a prefix which means $10^3$.

In $Mkm$, Mega is a prefix which means $10^6$.

If we write $Mkm,$ we would be writing two prefixes together and that's against the rules.

If it was $10^6m$, we could have written $1 Mm$ because there are no other prefixes included already.

Hence, we cannot write $10^6km$ as $1 Mm$.