What is the value of: $$(1 \times 2 + 3 \times 4 + 5 \times 6 + 7 \times 8 - 9 \times 10) \div 2 of 5$$ ?
=Â $$(1\times2+3\times4+5\times6+7\times8-9\times10)\div2\ of\ 5$$
=Â $$(2+12+30+56-90)\div10$$
= $$(10)\div10$$
= 1
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