Find the common difference of an ap, Mathematics

Assignment Help:

Find the common difference of an AP whose first term is 100 and sum of whose first 6 terms is 5 times the sum of next 6 terms.

Ans:    a = 100

APQ a1 + a2 + ....... a6 =5 (a7 + ........ + a12)

6( a1 + a6/2) = 5 x 6 (a7 +a12/2)

 

⇒ a + a + 5d = 5[a + 6d + a + 11d]

⇒ 8a + 80d = 0 (a = 100)

⇒ d = - 10.

 

 


Related Discussions:- Find the common difference of an ap

Explain graphing equations with a negative slope, Explain Graphing Equation...

Explain Graphing Equations with a Negative Slope? If the slope is a negative fraction, place the negative sign on either the numerator or the denominator. Example graph y = -2/

Converting., I need help converting my project fractions into 1

I need help converting my project fractions into 1

Differential equation (dy/dx) +x^2 = x^2*e^(3y), The general solution of th...

The general solution of the differential equation (dy/dx) +x^2 = x^2*e^(3y). Solution)(dy/dx) +x^2 = x^2*e^(3y) dy/dx=x 2 (e 3y -1) x 2 dx=dy/(e 3y -1) this is an elementar

Geometry, how much congruent sides does a trapezoid have

how much congruent sides does a trapezoid have

Properties of triangle, In triangle ABC, cosecA(sinB.sinC+cosB.sinC) is equ...

In triangle ABC, cosecA(sinB.sinC+cosB.sinC) is equal to..?

Fermats theorem, Fermat's Theorem  If f(x) has a relative extrema at x...

Fermat's Theorem  If f(x) has a relative extrema at x = c and f′(c) exists then x = c is a critical point of f(x). Actually, this will be a critical point that f′(c) =0.

3/8:5/9, how do I change this ratio to a fraction

how do I change this ratio to a fraction

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd