Loading [MathJax]/jax/output/HTML-CSS/jax.js


1)

If getting a head on a coin when it is  tossed is considered as success, then the probability  of having  more number of failures when  ten fair coins are tossed simultaneously , is 


A) 10528

B) 7327

C) 19329

D) 638210

Answer:

Option C

Explanation:

n=10, p=12, q= 12

  Required probability = P(r6)

 =P(r=6)+P(r=7)+P(r=8)+P(r=9)+P(r=10)

=10C6(12)10+10C7(12)10+10C8(12)10+10C9(12)10+(12)10

=1210(10C6+10C7+10C8+10C9+1)

 =1210(210+120+45+10+1)=386210=19329