Sequence/series problem

Algebra Level pending

The sum of all integers, which are multiples of 3 but not multiples of 5 and 6, from x x to 10000 is 6662400. Find the value of x x . The answer should the largest possible for x.


The answer is 411.

Choo Ming by Choo Ming , 20, Malaysia

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1 solution

Choo Ming
Aug 12, 2019

answer: 411

0 Helpful 1 Interesting 0 Brilliant 0 Confused

Wouldn't any x x from 400 400 to 411 411 work? ( 411 411 would be the smallest number allowed in any of these sums)

Chris Lewis - 1 year, 9 months ago

x from 400 to 411 also accepted.

Choo Ming - 1 year, 9 months ago

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