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use your intelligence and write a problem to work out

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jas_fluidm:
How many positive integers less than 500 can be formed using the numbers 1,2,3 and 5 for the digits?

jas_fluidm:
Solution:
4+4*4+3*4*4=68

jas_fluidm:
What is the remainder when 3^7 is divided by 8?
Ans: 3

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