Rahul was given the ages of five of his friends. The sum of the ages (in years) of all the possible pairs of his friends is 33, 34, 35, 35,36,36,37,37, 38, 39 respectively. Find the age (in yours) of the oldest friend, if it is know that the age of no two friends is the same.
21
19
20
CBD
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Answer: The age of the oldest freind is 21.
Step-by-step explanation:
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