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a)
= (2*1/2) +(3*1) +16
= 1+3+16 = 20
b)
= (3* 1/20) - (2* 2/12) +(4 * 6/14)
= 3/20 - 4/12 + 24/14
= 3/20 - 1/3 + 12/7