Homework Help: math

Posted by Edwin on Wednesday, September 23, 2009 at 3:28pm.

(b) the digits of a positive integer having three digits are in A.P and their sum is 15. The number obtained by reversing the digits is 594 less than the original number. Find the number.

(c) if a,b,c are in A.P, prove that (i) (ab)^-1, 1/ac, 1/bc are also in A.P. (ii) a(b+c)/bc, b(a+c)/ca, c(a+b)/ab are also in A.P.

(d) if a^2, b^2, c^2 are in A.P, prove that (i) 1/(b+c), 1/(c+a), 1/(a+b) are also in A.P. (ii) a/(b+c), b/(c+a), c/(a+b) are also in A.P.

(e) the sum to infinity of a G.P series is R. The sum to infinity of the squares of the terms is 2R. The sum to infinity of the cubes of the terms is (64/13)R. Find (i) the value of R. (ii) the first term of the first original series.

math - MathMate, Wednesday, September 23, 2009 at 6:13pm
See:
http://www.jiskha.com/display.cgi?id=1253734035

Answer this Question

Related Questions

math - (b) the digits of a positive integer having three digits are in A.P and ...
Maths - The digits of a three digit number are in AP&their sum is 15.The ...
math - The sum of the digits of a 2 digit num is 15 then the num obtained by ...
math - 1)a number of two digits is such that the digits is 11 and the number is...
Math help please - Show that one and only one out of n,n+4,n+8,n+12,n+16 is ...
8th Grade Algebra - These are extra credit questions, and I just want to know ...
algebra - The sum of the digits of a certain two-digit number is 7. Reversing ...
algebra word prob. - one more - The sum of the digits of a certain two-digit ...
Math - If a positive two-digit integer is divided by the sum of its digits, the ...
math - x has 3 digits. the tens digits is half the hundreds digits. the number ...

For Further Reading

First Name:
School Subject:
Answer: