15. Ifa.b = (a + b)/(a - b), find the value of 89 * 88. Is (89 +88) - (89 - 88) a whole number?
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answer value of 89*88 is (89+88)/(89-88)
answer value of 89*88 is (89+88)/(89-88)(89+88)-(89-88) is 178 so it is a whole number
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