Question

When a 'n' digit number is squared then the number of digit in the square thus obtained is ______.

Answer 1

Step-by-step explanation:

Correct option is

B

2n−1

C

n2

D

2n

Let us consider 1st number as 1

No. of digit : 1

Square : 12=1

No. of digit in square = 1 

satisfying options (B) and (C)

Now let us consider 2nd number as 4

No. of digit : 1

Square : 42=16

No. of digit in square = 2 

satisfying options (D)

If we take 3rd number as 25

No. of digit : 2

Square : 252=625

No. of digit in square = 3 

satisfying options (B)

Answer 2

Answer:

2n or 2n-1

hope this answer helps you