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Question
Write true (T) or false (F) for the following statement:
If a2 ends in 9, then a3 ends in 7.
Solution
False
a3 ends in 7 if a ends with 3.
But for every a2 ending in 9, it is not necessary that a is 3.
E.g., 49 is a square of 7 and cube of 7 is 343.
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