perplexus.info :: Just Math : Mas o menos vs comme il faut

Mas o menos vs comme il faut (Posted on 2021-12-04)

How many natural numbers exist in the range 142858 to 999999 inclusive, such that :
a. None of them is a multiple of 5.
b. The digit 3 is not contained in the number

D1 Please provide your estimate solution (p & p)
D3. Evaluate the exact result.

No Solution Yet Submitted by Ady TZIDON

Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re: estimated and calculated. MY. WAY

| Comment 2 of 3 |

(In reply to estimated and calculated by Larry)

From 0 to 1,000,000 exclusive there are 9*9*9*9*9*7 qualifying numbers.

Multiply by 6/7 , we get 354,294 due to a lesser range.

Posted by Ady TZIDON on 2021-12-04 10:11:08

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