)Square of 1 + 2 + 1 = 2 = 4, square of 1 + 2 + 3 + 2 + 1 = 3 = 9, square of 1 + 2 + 3 + 4 + 3 + 2 + 1 = 4 = 16, find 1 + 2 + 3 +... + 99 + 100 + 99 +... + 3 + 2 + 1=

)Square of 1 + 2 + 1 = 2 = 4, square of 1 + 2 + 3 + 2 + 1 = 3 = 9, square of 1 + 2 + 3 + 4 + 3 + 2 + 1 = 4 = 16, find 1 + 2 + 3 +... + 99 + 100 + 99 +... + 3 + 2 + 1=

Square of 100 = 10000