Page 17 - Digi notes maths
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9! 5! 5! 121
9! 126
7) So that the letters N, A, M, E always come together.
U R I C L NAME
5 letters are Free to be Always come
permutated together,
Assume it
as 1 letter
6! 4! 1
9! 21
8) So that the letters N, A, M, E never come together.
9! 6! 4! 20
9! 21
1. In a bag there are 5 red, 6 blue, 4 yellow, 7 green and 6 orange balls. 4
balls are to be selected at random. In how many ways the balls can be
selected.
In how many ways the balls can be selected having:
1) 2 red and 2 yellow balls.
C C 2 60
5 4
2
C 4 20475
28
2) 1 red, 1 green and 2 orange balls.
C 1 C 1 C 2 525
5 7 6
C 4 20475
28
3) 4 blue or 4 green balls.
Page 17 of 20
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9! 5! 5! 121
9! 126
7) So that the letters N, A, M, E always come together.
U R I C L NAME
5 letters are Free to be Always come
permutated together,
Assume it
as 1 letter
6! 4! 1
9! 21
8) So that the letters N, A, M, E never come together.
9! 6! 4! 20
9! 21
1. In a bag there are 5 red, 6 blue, 4 yellow, 7 green and 6 orange balls. 4
balls are to be selected at random. In how many ways the balls can be
selected.
In how many ways the balls can be selected having:
1) 2 red and 2 yellow balls.
C C 2 60
5 4
2
C 4 20475
28
2) 1 red, 1 green and 2 orange balls.
C 1 C 1 C 2 525
5 7 6
C 4 20475
28
3) 4 blue or 4 green balls.
Page 17 of 20
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