# Math

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How many five digit numbers can be formed from the set of nine numbers (0,1,2,3,4,5,6,7,8) if no number is repeated and no number starts with zero and
a) there are no other restrictins
b) the result must be an odd number

• Math -

so 8x8x7x6x5 = 13440

has to end with odd number, there are 4 of these

number of cases = 7x7x6x5x4 = 5880

• Math -

thank you!

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