Posted by HELP!!! on Tuesday, May 21, 2013 at 6:32am.
Let N be the number that consists of 61 consecutive 3's.
Let M be the number that consists of 62 consecutive 6's.
What is the digit sum of N×M?
Details and assumptions
The digit sum of a number is the sum of all its digits. E.g. the digit sum of N is 3+3+3+…+3+3+3=3×61=183
Answer not 555.

MATHS  Tony, Tuesday, May 21, 2013 at 7:06am
558
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