Question
Two cards are drawn successively without replacement
from a standard deck of 52 cards. Find the probability that both cards are aces.Solution
Total cards = 52, aces = 4. P(first card is ace) = 4/52 = 1/13 After drawing one ace, remaining aces = 3, remaining cards = 51 P(second card is ace | first ace) = 3/51 = 1/17 Required probability = (1/13) × (1/17) = 1/221 Answer: 1/221.
- A discount of 20% was offered on a product. If the product was marked 75% above the cost price, find the profit percentage.
Find minimum of x + 9/x for x>0.
The value of cos² 10° + cos² 20° + cos² 30° + ……. + cos² 90° is
1153, 1206, ?, 1326, 1393, 1464
Determine the value of 'x' if the average of the numbers 32, 34, 38, 21, 26, and 'x' is 30.
- Which of the following is NOT considered a network?
If a man rides a bicycle at a speed of 50 km/h for 2 hours and at a speed of 40 km/h for the next 4 hours then what will be the average speed?Â
HCF and LCM of two numbers are 13 and 455. If one number lies between 60 and 70, then the other number lies between
A trapezoid has bases of lengths 10 cm and 20 cm and an area of 180 cm². Find the height of the trapezoid.
16, 17, 35, 106, 425, ?
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