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HiiYou can go for prime factorisation and you can write 1980 as 11 *2*2*3*3*5 .In this you need multiple of 11 so the answer will be 3*3*2 = 18 factors.For other queries related to IIT JEE you can contact us at 0120-4616500 or you can email us at support@askiitians [dot]com
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