1. 40/56C2
2. 40/52C4
3. 30/56C2
4. 35/56C4.
40/52C4
1. 1/21
2. 49/101
3. 50/101
4. 51/101
50/101
1. 1/12
2. 1/18
3. 2/15
4. 3/14.
1/18
1. llPn×(9!)2
2. 11C5× (9!)2
3. 11P6×(9!)2
4. None of these.
11C5× (9!)2
1. m2 x n2
2. m(m+1)n("+1)/4
3. mC2 x nC2
4. None of these.
mC2 x nC2
1. 8C3, 7C3
2. 8C3, 7C2
3. 8P3, 7C3
4. 8P3, 7C2.
8C3, 7C2
1. 390
2. 520
3. 780
4. None of these.
780
1. 4444400
2. 8888800
3. 13333200
4. 6666600
6666600
1. nC3 - 2n - n x (n - 4)C1
2. n(n - 4)(n - 5)/3
3. n(n - 4)(n -5)/6
4. n(n - ll(n - 2)/3.
nC3 - 2n - n x (n - 4)C1
1. 18
2. 20
3. 24
4. 20.
18