math
posted by M .
The 20 leaves of a 40page book are numbered 1 through 40. The first and last leaves are ripped out. What is the sum of the remaining page numbers?

So what is the sum of 3+4+5+...37+38 ?
It is an arithemetic sum, first term 3, d=1
http://en.wikipedia.org/wiki/Arithmetic_progression
n= 36 terms
Sum= n/2 (2a+(n1)d) 
I got 738
Respond to this Question
Similar Questions

Math
A book has n consecutive pages torn out (each paper in a book has two sides  each side is one page). Suppose A is the last numbered page before the torn out section and B is the first numbered page following the tornout section. … 
math
A student opens a mathematics book to two facing pages. The product of the pages numbers is 420. Find the page numbers. The first page is ? 
algebra
A student opens a math book to two facing pages.The product of the page numbers is 210.Find the page numbers. The first page is _________ The second page is________ 
Math/Algebra
A student opens a mathematics book to two facing pages. The product of the page number is 420. Find the page numbers. The first page is ____ The second page is ____ 
algebra
A book has N consecutive pages torn out. Suppose A is the last numbered page before the torn out section and B is the forst numbered page following the torn out section. Fins the formula for N in terms of A and B * Each paper in the … 
math
The sum of the page numbers on the facing pages of a book is 457. Find the page numbers? 
algebra
A student opens a mathematics book to two facing pages. The product of the page number is 2352. Find the page numbers. The first page is__________ The secnd page is__________ 
Math
Pages in a book are numbered in typical fashion, starting with !. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur? 
Math
Pages in a book are numbered in typical fashion, starting with !. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur? 
algebra
The sum of two page numbers on facing page of a book is 81. What are the page numbers