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.
What will come in place of the question mark (?) in the following number series?
21, 42, 67, 96, ?, 166
What value should come in the place of (?) in the following number series?
500, 789, 428, ?, 340, 965
- What will come in place of (?) in the given number series.
1, 8, 27, ?, 125, 216 254, ?, 1022, 1150, 1214, 1246
What will come in place of (?) Question mark in the given number series.
500, 489, 467, 434, 390, 335, ?
What will come in place of the question mark (?) in the following series?
?, 65, 37, 73, 29, 81
18, 10, 12, 21, ?, 120
12    48      192      ?      3072       12288
...72, 90, 110, ?, 156, 182, 210
82, 98, 130, 178, 242, ?
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