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ABC and D are single digit positive integer values. [#permalink]
9*9*9*1 or 9*9*9*2 coz they said A, B, C, D are 4 positive number either D could be 5. Can anyone clear my doubt? As 0 can't be taken as positive integer

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Originally posted by Mandar3011 on 31 Jan 2022, 23:17.
Last edited by Mandar3011 on 01 Feb 2022, 01:01, edited 1 time in total.
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Re: ABC and D are single digit positive integer values. [#permalink]
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\(A, B, C, D\) all positive integers.

\(AD\) & \(DC\) both divisible by \(5\)

So \(D\) & \(C\) both will be \(5\) as they can't be \(0\)

\(A\) & \(B\) can take \(1-9\)

Total \(4\) digit nos \(= 9 * 9 * 1 * 1 *4! = 81 * 4! = 1944\)
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Re: ABC and D are single digit positive integer values. [#permalink]
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