1
105
C
2
6 4 512
2
⎛
⎞
=
=
⎜
⎟
×
⎝
⎠
(ii) P(at least six heads) = P(X ≥ 6)
= P (X = 6) + P (X = 7) + P (X = 8) + P(X = 9) + P (X = 10)
© NCERT
not to be republished
 576
MATHEMATICS
=
10
10
10
10
10
10
10
10
10
10
6
7
8
9
10
1
1
1
1
1
C
C
C
C
C
2
2
2
2
2
⎛
⎞
⎛
⎞
⎛
⎞
⎛
⎞
⎛
⎞
+
+
+
+
⎜
⎟
⎜
⎟
⎜
⎟
⎜
⎟
⎜
⎟
⎝
⎠
⎝
⎠
⎝
⎠
⎝
⎠
⎝
⎠
=
10
10 10