In a party 15 people shake their hands with each other. How many times did the handshakes take place?
ক) 120
খ) 105
গ) 135
ঘ) 165
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ক) 0.00004/0.005
খ) 0.01/0.003
গ) 0.003/0.006
ঘ) 0.001/0.01
ক) USA
খ) Hong-Kong
গ) Japan
ঘ) Germany
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