TCS Company Numerical Ability Geometry

Which of the following are orthogonal pairs? a. 3i+2j b. i+j c. 2i-3j d. -7i+j ???,.

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TCS Other Question

Cow and horse are brought for rupees 2,00,000. Cow is sold at profit of 20% and horse at loss of 10%. Overall gain is 4,000 rupees. so what is the cost price of cow? If it is a 3x3 matrix, for which elements
in first row are (V, 50, W), second row (196,
X, Y)and in third row are (269, Z, 123).It is
given that the sum of the numbers in each
row, column, diagonal are same. Then find
the value of (Y + Z).