Answer:
When n is 1
5-2n
=5-2*1
=5-2
=3
When n is 2
=5-2*2
=5-4
=1
When n is 3
=5-2*3
=5-6
=-1
When n is 4
=5-2*4
=5-8
=-3
When n is 10
=5-2*10
=5-20
=-15
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