Calculate :
(-1)101 +(-1)102 + (-1)103 +...+(-1)200
.
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(-1)101 + (-1)102 + (-1)103 + ..... + (-1)200
= (-1)(101 + 102 + 103 + .... + 200)
Sn = (n/2)(a + an)
a = 101
an = 200
n = 100
Sn = (100/2)*(101 + 200) = 50*(301) = 15050
= (-1)(101 + 102 + 103 + .... + 200)
= (-1)*15050
= -15050 ——> Answer
= (-1)(101 + 102 + 103 + .... + 200)
Sn = (n/2)(a + an)
a = 101
an = 200
n = 100
Sn = (100/2)*(101 + 200) = 50*(301) = 15050
= (-1)(101 + 102 + 103 + .... + 200)
= (-1)*15050
= -15050 ——> Answer
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