Friday

August 22, 2014

August 22, 2014

Posted by **jack** on Tuesday, June 18, 2013 at 1:50pm.

If S=a/b, where a and b are co prime positive integers, what is the value of a+b?

- math -
**Count Iblis**, Tuesday, June 18, 2013 at 1:53pmS(x) = 1 + x + x^2 + x^3 +... = 1/(1-x)

dS/dx = 1 + 2 x + 3 x^2 + 4 x^3 +...

= 1/(1-x)^2

- math -
**jack**, Tuesday, June 18, 2013 at 2:12pmwhat's the sum of infinite terms?

- math -
**jack**, Tuesday, June 18, 2013 at 2:16pmthanks i have now understood the problem.............

- math -
**Abhishek Ranjan**, Wednesday, June 19, 2013 at 3:59am41

**Related Questions**

MATH - Let’s agree to say that a positive integer is prime-like if it is not ...

math - Let’s agree to say that a positive integer is prime-like if it is not ...

math-geometry - 1. A rhombus has a perimeter of 96, and the length of one of its...

discrete math - which positive integers less than 12 are relatively prime to 13 ...

Math - Let S(n) denote the sum of digits of the integer n. Over all positive ...

MATH - TWO INTEGERS ARE DEFINED AS "PARTNERS" IF BOTH OF THEIR PRIME ...

maths - x and y are positive real numbers that satisfy logxy+logyx=174 and xy=...

maths~ - x and y are positive real numbers that satisfy logxy+logyx=174 and xy=...

maths - x and y are positive real numbers that satisfy logxy+logyx=174 and xy=...

pls heeelp math - For each positive integer n, let H _{n} = 1/1 +1/2 +⋯+ 1...