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 CExplanation:n=10, p=12, q= 12 ∴ Required probability = P(r≥6) =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