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$A$ group of students comprises $5$ boys and $n$ girls. If the number of ways in which a team of $3$ students can be selected from this group such that there is at least one boy and at least one girl in each team is $1750$,then $n$ is equal to:

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The number of ways in which $35$ apples can be distributed among $3$ boys so that each can have any number of apples,is

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The value of $\sum_{r=0}^{20} {}^{50-r}C_{6}$ is equal to

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$^nC_r \div ^nC_{r-1} = $

$A$ customer forgets a $4$-digit code for an Automatic Teller Machine ($A$.$T$.$M$.) in a bank. However,he remembers that this code consists of digits $3, 5, 6$ and $9$. Find the largest possible number of trials necessary to obtain the correct code.

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