Click to Chat

1800-2000-838

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
```        Let heads means 1 and Tails means 2 while tossing a coin.
The coefficients of a quadratic equation ax2+bx+c=0 are chosen by tossing 3 fair coins.The chance that the roots of quadratic equation are non-real is?
a)3/8
b)7/8
c)5/36
d)11/36```
6 years ago

Mir Noaman Ali IIT-Roorkee
57 Points
```										a can be filled in 2 ways(head=1 and tails=2) similarly b in 2 ways and c also in 2 ways so total number of ways = 8 let the probability that the roots are real is x and non real becomes 1-x let us calulate x first, x means it must have real roots  discriminant greater that or equal to zero b*2 >= 4ac of those 8 equally probable cases there is only 1 case( when b=2, a=c=1   when coin corresponding to a and c gets a head and coin corresponding to b gets a tail which satisfies this case so probability =1/8 hence x=1/8 so required answer is 1-x = 7/8       ....................... please approve my answer if you have understood the solution
```
6 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Magical Mathematics[Interesting Approach]

View all Questions »
• Complete JEE Main/Advanced Course and Test Series
• OFFERED PRICE: Rs. 15,900
• View Details
• Complete JEE Main/Advanced Course and Test Series
• OFFERED PRICE: Rs. 15,900
• View Details