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how many different ways can make 15p
15p/£1 = 15p/100p = 15/100 or 3/20
Given T = R + RS Lateral inversion makes it to be R + RS = T Taking R as common factor, we get R(1+S) = T Now dividing by (1+S) both sides, R = T / (1+S) Hence the solution R = T/(1+S)
r=0,Tr-r = 0 = r(T-1), since T != 1, then T-1 is non zero so r must be zero.
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