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126.A person buys a horse for 15 ponds after one year he sells it for 20 pounds .After one year , again he buys the same horse at 30 pounds and sells it for 40 pounds. What is the profit for that person?|

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124. There are 11 Boys in a family . Youngest child is a boy . What is the probability of all are boys?
Which of the following are orthogonal pairs?

a. 3i+2j b. i+j c. 2i-3j d. -7i+j