Find how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive, have the following properties: (a) are divisible by 7. 1286 (b) have distinct digits. 4536 (c) are divisible by 5 and by 7. 257 (d) are not divisible by either 5 or 7.

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Find how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive,
have the following properties:
(a) are divisible by 7.
1286
(b) have distinct digits.
4536
(c) are divisible by 5 and by 7.
257
(d) are not divisible by either 5 or 7.
Transcribed Image Text:Find how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive, have the following properties: (a) are divisible by 7. 1286 (b) have distinct digits. 4536 (c) are divisible by 5 and by 7. 257 (d) are not divisible by either 5 or 7.
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