1
JEE Main 2021 (Online) 25th July Evening Shift
+4
-1
If $${}^n{P_r} = {}^n{P_{r + 1}}$$ and $${}^n{C_r} = {}^n{C_{r - 1}}$$, then the value of r is equal to :
A
1
B
4
C
2
D
3
2
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
The sum of all the 4-digit distinct numbers that can be formed with the digits 1, 2, 2 and 3 is :
A
26664
B
122664
C
122234
D
22264
3
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
If the sides AB, BC and CA of a triangle ABC have 3, 5 and 6 interior points respectively, then the total number of triangles that can be constructed using these points as vertices, is equal to :
A
240
B
360
C
333
D
364
4
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
Team 'A' consists of 7 boys and n girls and Team 'B' has 4 boys and 6 girls. If a total of 52 single matches can be arranged between these two teams when a boy plays against a boy and a girl plays against a girl, then n is equal to :
A
5
B
2
C
4
D
6
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