Question

which of the following coins does not exist in Indian currency​

Answer 1

Answer:

Simple logic behind the coins manufacturing is ,

It should be a denomination that is easy for calculation

There should be minimum coins which can be used extensively to represent any amount.

Lets say 3 rs is there. What is it's purpose? you can replace it by the following way ( one one rupee and one two rupee)

3 = 1 x 1 + 1 x 2

But you can ask what is the purpose of 2 rs coin when 2 rs can be expressed as 2 one rupee coins? Assuming two rupee coin does not exist, to represent 4 rupees, the government has to create 4 one rupee coins. The cost require to make a two rupee coin is very less than two one rupee coins. So, removing the two rupee coin reduces the difference between the face value and intrinsic value of the money in circulation which is technically called ( a kind of profit to government in making money). So two rupee coins are a must to reduce the manufacturing cost of coins for a given money circulation

If 3 rupees present, then the only scenario it would be useful is to represent "5N+3" amounts where n is 0,1,2...

For eg, 18 = (3 x 5) + (1 x 3) instead of 18 = (3 x 5) + (1 x 1) + (1 x 2)

which is an edge case.

Having the denominations like 3, 4 7 complicate calculations. If you notice not only in coins , in weighing machines as well we follow the same pattern

1, 2, 5, 10, 20, 50, 100, 200, 500, 1000,.....

By this , you can represent any money with "minimum coins with minimum complexity in calculations as it is mostly multiple of 5 or 10".

Step-by-step explanation:

Hi...

Hope it helps you..