Question
From a well-shuffled deck of 52 cards, two cards are
drawn one after the other without replacement. What is the probability that the first card is a red ace and the second card is black?Solution
ATQ, Number of red aces in the pack = 2 Number of black cards in the pack = 26 Since 1st  card is not put back. So, the required probability: (2 C1 /52 C1 ) * (26 C1 /51 C1 ) = (2/52) × (26/51) = 1/51
7 7 ? 43 163 831
...10, 94, 115, 138, 163, ?
80, 120, 30, 45, 9, 13.5, ?
25, ?, 87, 159, 269, 425Â
- What will come in place of (?) in the given number series.
121, 100, 81, 64, ?, 36 What will come in place of the question mark (?) in the following series?
4, 8, 2, 12, 1.5, ?
- What will come in place of (?) in the given number series.
2, 6, 15, 31, 56, ? 38% of 18/225 of 31/19 of 15225 =?
456, 460, 444, 508, 252, ?
What will come in place of the question mark (?) in the following number series?
29, 30, 33, ?, 69, 150