Arithmetic progression Assignment Help

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Arithmetic progression (A. P.):

An A.P. is a sequence whose terms increase or decrease by a fixed number, defined as the common difference of the A.P.

nth Term and  Addition of n Terms:

If a is the first term and d the general difference, the A.P. can be known as a, a + d, a + 2d, .... The nth term  an is given by an = a + (n - 1)d.

The sum Sn of the first  nth terms of such an A.P. is shown by 2080_Arithmetic progression.png(a + l ) where l  is the last term (i.e. the nth term of the A.P.).

Notes

  • If a fixed number is subtracted or added to each term of a provided A.P. then the resulting linear sequence is also an A.P. with the similar common difference as that of the provided A.P.
  • If each and every term of an A.P. is product by a fixed number(say k) (or divided by a non-zero fixed number), the resulting linear sequence is also an A.P. with the common difference multiply by k.
  • If a1, a2, a3.....and b1, b2, b3...are two A.P.'s with basic differences d' and d respectively then a1+b1, a2+b2, a3+b3,...is also an A.P. with basic difference d+d'
  • If we have to take three terms in an A.P., it is convenient to get them as a - d, a,
    a + d. Usually, we take a - rd, a - (r - 1)d,......a - d, a, a + d,.......a + rd in that case we have to take (2r + 1) related terms in an A.P
  • If we have to take four parts, we take a - 3d, a - d, a + d, a + 3d. In general, we take
    a - (2r - 1)d, a - (2r - 3)d,....a - d, a + d,.....a + (2r - 1)d, in that type we have to take 2r terms in an A.P.
  • If a1, a2, a3, ....... an are in A.P. then a1 + an = a2 + an-1 = a3 + an -2 = . . . . . and so on.

 

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