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= 25 × 100
= 2500
b. 1-2+3-4+5-6+7-8+..100 = -1 × 100/2
= -50
c. -100-99-98-...-2-1-0+1+2+...+48+49+50 = 151/2 × (-100 + 50)
= 151/2 × -50
= 151 × -25
= -3775