Skip to content
dronacharya.ai
← JEE Main 2022 · 26 Jun · Shift 1
MathematicsInteger+4 / -1Question 22 of 90

JEE Main 2022 · 26 Jun · Shift 1, Mathematics question 22

There are ten boys B1,B2,…,B10B_1,B_2,\dots,B_{10} and five girls G1,G2,…,G5G_1,G_2,\dots,G_5 in a class. Then the number of ways of forming a group consisting of three boys and three girls, if both B1B_1 and B2B_2 together should not be the members of a group, is ______.

Answer and worked solution

Official answer: 1120

All groups. (103)(53)=120×10=1200\binom{10}3\binom53=120\times10=1200.

Both B1B_1 and B2B_2. (81)(53)=80\binom81\binom53=80.

Answer. 1200−80=11201200-80=1120.

Answer: 1120