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Question Number 124824 by ZiYangLee last updated on 06/Dec/20
Howmanypositivefour−digitsintegersabcdsatisfythefollowingconditions:(i)abcdisdivisiblehy7;(ii)Whenthefirstandthelastdigitsareinterchanged,theresultingnumberdbcaisstillapositivefour−digitsnumberthatisdivisibleby7.
Commented by mr W last updated on 06/Dec/20
abcdmustbedifferentdigits?
Commented by ZiYangLee last updated on 06/Dec/20
wellastheoriginalquestiondoesnotmentionit,ithinkabcdcanbesamedigitsalso(?
then(i)1001,1008,1015,...,9996⇒1+9996−10017=1286numbers
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