Question

23. 2 - 2 + 2 - 2 + ......... 101 terms =? (P.C.S., 2008)
(a) - 2
(b) 0
(c) 2
(d) None of these
A​

Answer 1

Answer:

2 will be your answer my friend

Answer 2

Step-by-step explanation:

The smallest (and unique up to rotation and reflection) non-trivial case of a magic square, order 3

In recreational mathematics and combinatorial design, a magic square[1] is a {\displaystyle n\times n}n\times n square grid (where n is the number of cells on each side) filled with distinct positive integers in the range {\displaystyle 1,2,...,n^{2}}{\displaystyle 1,2,...,n^{2}} such that each cell contains a different integer and the sum of the integers in each row, column and diagonal is equal.[2] The sum is called the magic constant or magic sum of the magic square. A square grid with n cells on each side is said to have order n.

The mathematical study of magic squares typically deals with its construction, classification, and enumeration. Although completely general methods for producing all the magic squares of all orders do not exist, historically three general techniques have been discovered: by bordering method, by making composite magic squares, and by adding two preliminary squares. There are also more specific strategies like the continuous enumeration method that reproduces specific patterns. The magic squares are generally classified according to their order n as: odd if n is odd, evenly even (also referred to as "doubly even") if n = 4k (e.g. 4, 8, 12, and so on), oddly even (also known as "singly even") if n = 4k + 2 (e.g. 6, 10, 14, and so on). This classification is based on different techniques required to construct odd, evenly even, and oddly even squares. Beside this, depending on further properties, magic squares are also classified as associative magic squares, pandiagonal magic squares, most-perfect magic squares, and so on. More challengingly, attempts have also been made to classify all the magic squares of a given order as transformations of a smaller set of squares. Except for n ≤ 5, the enumeration of higher order magic squares is still an open challenge. The enumeration of most-perfect magic squares of any order was only accomplished in the late 20th century.

In regard to magic sum, the problem of magic squares only requires the sum of each row, column and diagonal to be equal, it does not require the sum to be a particular value. Thus, although magic squares may contain negative integers, they are just variations by adding or multiplying a negative number to every positive integer in the original square.[3][4] Magic squares composed of integers {\displaystyle 1,2,...,n^{2}}{\displaystyle 1,2,...,n^{2}} are also called normal magic squares, in the sense that there are non-normal magic squares[5] whose integers are not restricted to {\displaystyle 1,2,...,n^{2}}{\displaystyle 1,2,...,n^{2}}. However, in some places, "magic squares" is used as a general term to cover both the normal and non-normal ones, especially when non-normal ones are under discussion. Moreover, the term "magic squares" is sometimes also used to refer to various types of word squares.

Magic squares have a long history, dating back to at least 190 BCE in China. At various times they have acquired magical or mythical significance, and have appeared as symbols in works of art. In modern times they have been generalized a number of ways, including using extra or different constraints, multiplying instead of adding cells, using alternate shapes or more than two dimensions, and replacing numbers with shapes and addition with geometric operations.

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