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Identical black tiles, in the shape of a square of side 3 cm, are placed along the two diagonals of a square shaped floor of side 39 cm. The rest of the floor is covered with identical white tiles of same shape and size. How many white tiles need to be replaced by the black tiles so that the black and the white tiles are in alternate positions in all the rows and columns?
Find the value of (50*1)+ (49*2) + (48*3)+.....(1*50) ???
The options available are
a) 21050
b)22100
c)23100
d)24200
e)21300