What is the difference of largest and smallest prime number between 60 and 80 ?
ক) 8
খ) 12
গ) 18
ঘ) 140
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ক) http://vianet.com/index/htm
খ) F:EmailStandard
গ) Jahid@billme.com
ঘ) Chaminade.org/teachers/mailaddresses
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খ) 60
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