Gravity Classes  Your Search for Best IIT-JEE/AIEEE Coaching Ends Here....
    About Gravity Classes  
Nurtured by two enterprising graduates of the Department of Chemical Engineering & Bio-Chemical Engineering, IIT Delhi, GRAVITY CLASSES came into existence in January 2007.
 
       Home   About us   Courses   IIT - JEE Papers   DPT Result   Downloads   Contact Us

  Arithmetic mean between two numbers
Go Back  

 When three numbers are in A.P., the middle term is called arithmetic mean (AM) of the two others.

 
Let a and b are two numbers.
 
And A be the arithmetic mean between two numbers.
 
So a A b are in A.P.
 
or,    A – a = b – A
 
or,    2A = a + b
 
        A =a+b/2
 
So, in general
 
A.M. = Sum of the numbers/2                                                     …… (5)
 
Similarly we can find the two arithmetic means between two number. A1 and A2 are two arithmetic mean between two member a and ‘b’ then a, A1, A2 b are in A.P.
 
Now using the formula,
 
        tn = a+(n–1)d
 
or,    d = b–a/3 [ here n = 4]
 
so,    A1 = a + d = a +b–a/3 = 2a+b/3
 
and   A2 = a + 2d = a + 2(b–a)/3 = a+2b/3



  Our Courses

  One Year program.

   Two Year program.

   Crash Course.
 
  Assignments

  Physics.

   Chemistry.

   Maths.
© 2010 Gravityclasses.co.in