The number of ways, 16 identical cubes, of which 11 are blue and rest are red, can be placed in a row so that between any two red cubes there should be at least 2 blue cubes, is ______.
← JEE Main 2022 · 27 Jun · Shift 1
MathematicsInteger+4 / -1Question 24 of 90
JEE Main 2022 · 27 Jun · Shift 1, Mathematics question 24
Answer and worked solution
Official answer: 56
Place the reds. Put 2 blues between each pair of the 5 reds: 8 blues used, 3 left.
Distribute the 3 spare blues into the 6 gaps: .
Answer: 56