Question
A box contains eight Rs. 1 coins, ten Rs. 2 coins, and two
Rs. 5 coins. One coin falls out and gets lost. What is the probability that the lost coin is not a Rs. 5 coin?Solution
Number of Rs. 5 coins = 2
Total number of coins = 8 + 10 + 2 = 20
So, the required probability = 1 - 2/20 = 18/20 = 9/10
41 28 ? 15 67 2
3 15 35 63 99 ?
4                14                  130                     512                �...
1 1 8 4 27 9 81
...Select the number from among the given options that can replace the question mark (?) in the following series.
24, 35, 51, 73, 102, ?
4 5 12 39 160 ?
...10, 22, 46, ?, 130, 190
3  16  22  ?   98   206
542Â Â Â Â Â Â 541Â Â Â Â Â Â Â 532Â Â Â Â Â Â Â 507 Â Â Â Â Â Â Â 458Â Â Â Â Â Â Â ?
...If   314     306      x      269       394    178    1480
Then, 1/3 x + 2x - x = ?
...
