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CBSE Class 9 Answered

qus 1  - Show how if two coins are tossed simultaneously. the probablity of getting atmost one head is 3/4.
 
 
qus 2 - A bag contains 50 coins and each coin is marked from 51 to 100. one coin is picked at random. find the probability that the number on the coin is a prime number.
Asked by Varsha | 25 Jan, 2015, 06:09: PM
answered-by-expert Expert Answer
I f space t w o space c o i n s space a r e space s i m u l t e n e o u s l y space t o s s e d comma space t h e space s a m p l e space s p a c e space w i l l space b e left curly bracket left parenthesis H H right parenthesis comma left parenthesis H T right parenthesis comma left parenthesis T H right parenthesis comma left parenthesis T T right parenthesis right curly bracket n left parenthesis S right parenthesis equals 4 G e t t i n g space a t m o s t space o n e space h e a d space m e a n s space t h a t space e i t h e r space n o space h e a d space o r space a space m a x i m u m space o f space o n e space h e a d. N o. space o f space f a v o u r a b l e space o u t c o m e s equals left curly bracket left parenthesis H T right parenthesis comma left parenthesis T H right parenthesis comma left parenthesis T T right parenthesis right curly bracket n left parenthesis E right parenthesis equals 3 P left parenthesis G e t t i n g space a t m o s t space o n e space h e a d right parenthesis equals 3 over 4
Please post each question separately.
Answered by Prasenjit Paul | 26 Jan, 2015, 01:30: AM

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