Two couples act on the beam as shown. determine the magnitude of f so that the resultant the resultant couple moment is 300 lbft
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Nth term = an = 7-4n
first term = a1 = 7-4(1) = 7-4 = 3
second term = a2 = 7-4(2) = 7-8 = -1
second term - first term = a2 - a1 = common difference(d)
= -1-3 = -4
Therefore common difference(d) = -4
first term = a1 = 7-4(1) = 7-4 = 3
second term = a2 = 7-4(2) = 7-8 = -1
second term - first term = a2 - a1 = common difference(d)
= -1-3 = -4
Therefore common difference(d) = -4
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