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Comma is inserted after every:

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Two numbers

Period

Digit

Place

answer is B.

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Detailed Solution

We have to tell that while writing a number, where do we insert comma.

So, comma is inserted after every period.

Let us understand it with help of place value chart.

Periods

Millions

Thousands

Ones

International

System

Place Value

H.M

T.M

H.Th

T.Th

Number

615432897

6

1

5

4

3

2

8

9

7

So, the commas will be inserted as below:

$615, 432, 897$

Now, we will take the place value chart of Indian System.

Periods

Crores

Lakhs

Thousands

Ones

International

System

Place Value

T.C

T.L

T.Th

Number

615432897

6

1

5

4

3

2

8

9

7

So, the commas will be inserted as below:

$61, 54, 32, 897$

Hence, option B is correct.

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