On the occasion of Dipawali festival each student of a class sends greeting cards to one another. If the postmen deliver $1640$ greeting cards to the students of this class, then the number of students in the class is

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Solution

The correct option is A 41
let number of students is $n$ , then number of cards $= 2 \times^{n} C_{2} = n (n - 1) = 1640$
Hence $n = 41$

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On the occasion of Dipawali festival each student of a class sends greeting cards to one another. If the postmen deliver 1640 greeting cards to the students of this class, then the number of students in the class is

The correct option is A 41let number of students is n, then number of cards =2×nC2=n(n−1)=1640Hence n=41

On the occasion of Dipawali festival each student of a class sends greeting cards to one another. If the postmen deliver $1640$ greeting cards to the students of this class, then the number of students in the class is

The correct option is A 41
let number of students is $n$ , then number of cards $= 2 \times^{n} C_{2} = n (n - 1) = 1640$
Hence $n = 41$