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The usual for...

Question

The usual form of $1000 a + 10 b + c$ is

$abc$

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$abco$

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$aobc$

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$aboc$

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Solution

The correct option is C
$aobc$

Write the usual form of $1000 a + 10 b + c$ .
Step1:The general representation of a number is as follows
For a two-digit number say $AB$
$A \times 10 + B \times 1$
A three-digit number says $ABC$
$A \times 100 + B \times 10 + C \times 1$
A four-digit number says $ABCD$
$A \times 1000 + B \times 100 + C \times 10 + D \times 1$
Step2:The usual form of $1000 a + 10 b + c$ .
The usual form to represent $aobc$ is $1000 x a + 100 x 0 + 10 x b + 1 x c$ , which is equal $1000 a + 10 b + c$
$∴$ The correct option is C.

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