6. Simplify the followings:- (4M)
a). 62-(16+72:4{20-(5-2-1)}]
b). 56-{3.8:2+(2-1.8)
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a) 62-(16+72:4(20-(5-3)
=62-(16+72:4(20-4)
=62-(16+72:4(16)
=62-(16+18×16)
=62-304
=-242
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