Find :- 1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20.
Answer is -10.
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Answer:
-10
Step-by-step explanation:
take the odd 1st
1+3+5+7+9+11+13+15+17+19=100
now take even
2+4+6+8+10+12+14+16+18+20=110
Even number has negative sign,so
consider it as (-110)
sum the odd and even
we get
100-110=-10
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