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S10= 5 (100-36) =320
b. S20 = 20/2 (2. -22+(20-1)4)
S20 = 10(-44+76) = 320
s10=5(100+9.-4)
=5(100-36)
=5(64)
=320
s20=10(2.-22+19.6)
=10(-44+114)
=10(70)
=700