An algebra problem by d w

Algebra Level 2

Every third digit is removed from the sum of the first 1000 positive integers. 1 + 2 + 4 + 5 + 7 + 8 + 10 + 11 + · · · + 998 + 1000 =x

What is x?

500500 333667 889111 166833

D W by d w , 21, Canada

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1 solution

Uahbid Dey
Sep 6, 2015

7 Helpful 0 Interesting 0 Brilliant 0 Confused

Can you tell us how 1000 x 1001 2 \frac{1000x1001}{2} comes from ?

U p v o t e d \color{grey}{Upvoted}

Syed Baqir - 5 years, 9 months ago

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1+2+3+4+5+........+n = ½ . n . (n+1) ... its a formula which you can find in the summation of series chapter in algebra book.

Uahbid Dey - 5 years, 9 months ago

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OOPs I thought X is a variable , It is symbol of multiplication.

Old School Error rrrr ....... :D

t h a n k s \color{#D61F06}{thanks}

Syed Baqir - 5 years, 9 months ago

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