001 has one significant digit, so the answer can only have one. 1.2 x 001 = 1
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10 of 1 digit, 45 of 2 digits and 120 of 3 digits making 175 in all.
here is 150 digits of pi by memory; 3.14159265358979323846264338327950288419716939937510582097494459230781640 628620899862803482534211706798214808651328230664709384460955058223179408128
If you're limited to only 5 digits that can't be repeated, then there are 120 ways they can be arranged.
It is 120 if the digits cannot be repeated.
The number 120 000 000 000 000 000 is 120 quadrillion.