1
JEE Main 2023 (Online) 11th April Morning Shift
Numerical
+4
-1
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In an examination, 5 students have been allotted their seats as per their roll numbers. The number of ways, in which none of the students sits on the allotted seat, is _________.

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2
JEE Main 2023 (Online) 10th April Evening Shift
Numerical
+4
-1
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The sum of all the four-digit numbers that can be formed using all the digits 2, 1, 2, 3 is equal to __________.

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3
JEE Main 2023 (Online) 10th April Morning Shift
Numerical
+4
-1
Change Language

The number of permutations, of the digits 1, 2, 3, ..., 7 without repetition, which neither contain the string 153 nor the string 2467, is ___________.

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4
JEE Main 2023 (Online) 10th April Morning Shift
Numerical
+4
-1
Change Language

Some couples participated in a mixed doubles badminton tournament. If the number of matches played, so that no couple played in a match, is 840, then the total number of persons, who participated in the tournament, is ___________.

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