self Maths Puzzle

how many 6 digits even no can be formed from digits 1,2,3,4,5,6 and 7 so that the digits should not repeat??

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self Other Question

how many 4 digit numbers divisible by 5 can be formed with digits 0,1,2,3,4,5,6 and 6? how many 4 digit nos are there which have digits 1,2,3,4,5,6,7 and 8 such that digit 1 appears only once?