In a class of boys and girls vikas's rank is 9th and tanvi's Rank is 17th . Vikas's Rank among the boys in that class is 4th from the top and 18th from the bottom and tanvi's rank among the girls is 8th from top and 21st from bottom. In the order of rank, how many girls are there between tanvi and vikas? a1 b2 c5 d3
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