Q: Why can't the product of two 2-digit numbers ever be two digit?

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this question is not soluble.the information given reduces the no. of candidates from 9999 to 900 but cant get closer than that

How many place combinations in a four digit number and all have to go in different spot example: 1234, 4321, 2134 etc. numbers can't change and have to stay four numbers?The answer would be 36 different combinations. This is simply the counting principle and it's easy for anyone to learn.

The numbers 1, 2 or 3 are such numbers.

How can 2 prime numbers ever be equal They cant be Equal.

2 and 3 are prime numbers.

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You cannot

Because it will have those numbers as factors.

this question is not soluble.the information given reduces the no. of candidates from 9999 to 900 but cant get closer than that

that question cant be answered unless it was 3 odd-digits or 4 odd-digits with 1 even digit i think.

prime numbers

If you means, total 3 digit numbers, then that wouldbe 9*10*10 as 0 cant come at first place, so 9 and in other two places, all 10 digits can be placed. total = 900.

How many place combinations in a four digit number and all have to go in different spot example: 1234, 4321, 2134 etc. numbers can't change and have to stay four numbers?The answer would be 36 different combinations. This is simply the counting principle and it's easy for anyone to learn.

cant it's not a sixteen-digit code

11+1+1+3+5(we cant perform the operation by direct methods sine addid 6b numbers from this set of numbers ll always give even number)

The numbers 1, 2 or 3 are such numbers.

you cant

you cant