perplexus.info :: Numbers : No Addition Allowed

No Addition Allowed (Posted on 2009-12-14)

Without using addition, make five 6s to equal 30.
Without using addition, make six 7s to equal 42.

The calculations should be exact (no rounding functions). Any common symbols or operators other than addition are allowed.

Replacing addition with subtracting a negative is NOT a solution.

See The Solution Submitted by Brian Smith

Rating: 3.5000 (2 votes)

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

re: triangular numbers

Comment 6 of 6 |

(In reply to triangular numbers by Ady TZIDON)

When I wrote the problem I put in the first answer I came up with. I did not bother looking for extra solutions.

Posted by Brian Smith on 2009-12-15 14:38:10

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