### 10 Answers

1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 0 = 0

Any given one digit number by definition corresponds to a number not containing leading zeroes.

This rules out 0 as a one digit number.

ACCORDINGLY, total numbers of one digit numbers is always NINE and not ten as mentioned in the problem.

It is easy to observe that, product of all the one digit numbers

= 1*2*3*4*5*6*7*8*9

= 362880.

If you mean 0 to 9, then the product will be zero.

0*1*2*3*4*5*7*8*9 = 0 (any number times 0 is zero)

Do you mean 0 to 9? The product of these is 0.

Zero.

anything multiplied by zero is zero and the ten one digit numbers contain zero.

The ten one digit numbers are 0,1,2,3,4,5,6,7,8,9.

When u multiply them u get 0. And that’s the answer 0.

42

(1)

9

∏ X i (for each X Є Z ) = Zero

i =0

it’s also = 9! * 0 = Zero

(2)

10

∏ X i (for each X Є Z ) = 10! = 3628800

i =1

did you mean 0 to 9

anything multiplied with 0 is 0

did you mean -9 to 0

the same applies here.

answer for both=0

Zero.