In a class there are certain number of students. On the new year day every student posts a greeting card to all of his classmates. If the total number of greeting cards posted by them is $870$ Then find the number of students.

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$l e t n u m b e r o f s t u d e n t s b e n t h e n t o t a l n u m b e r o f g r e e t i n g c a r d s = n \times (n - 1) a s n (n - 1) = 870 o r n (n - 1) = 30 \times 29 ∴ n = 30$

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In a class there are certain number of students. On the new year day every student posts a greeting card to all of his classmates. If the total number of greeting cards posted by them is 870 Then find the number of students.

letnumberofstudentsbenthentotalnumberofgreetingcards=n×(n−1)asn(n−1)=870orn(n−1)=30×29∴n=30

In a class there are certain number of students. On the new year day every student posts a greeting card to all of his classmates. If the total number of greeting cards posted by them is $870$ Then find the number of students.

$l e t n u m b e r o f s t u d e n t s b e n t h e n t o t a l n u m b e r o f g r e e t i n g c a r d s = n \times (n - 1) a s n (n - 1) = 870 o r n (n - 1) = 30 \times 29 ∴ n = 30$