If there are 30 people, and all of them shake hand with one another, how many total number of handshakes?
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0
Answer:
30×29=870 (may be the answer)
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1
Answer:
29+28+27+26+25+24+23+22+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1 is 435
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