Probability of not selecting a one rupee coin:

To find the probability of not selecting a one rupee coin, we need to calculate the total number of coins in the bag and the number of coins that are not one rupee coins.

Total number of coins in the bag:
There are 15 one rupee coins, 25 two rupee coins, and 10 five rupee coins in the bag. Therefore, the total number of coins in the bag is:
Total number of coins = 15 + 25 + 10 = 50 coins

Number of coins that are not one rupee coins:
To find the number of coins that are not one rupee coins, we need to subtract the number of one rupee coins from the total number of coins in the bag.
Number of coins that are not one rupee coins = Total number of coins - Number of one rupee coins
Number of coins that are not one rupee coins = 50 - 15 = 35 coins

Probability of not selecting a one rupee coin:
The probability of not selecting a one rupee coin can be calculated using the formula:
Probability = Number of favorable outcomes / Total number of possible outcomes

In this case, the number of favorable outcomes is the number of coins that are not one rupee coins, which is 35 coins. The total number of possible outcomes is the total number of coins in the bag, which is 50 coins.

Therefore, the probability of not selecting a one rupee coin can be calculated as follows:
Probability = Number of coins that are not one rupee coins / Total number of coins in the bag
Probability = 35 / 50 = 0.7

Therefore, the probability of not selecting a one rupee coin is 0.7 or 70%.

Conclusion:
The probability of not selecting a one rupee coin from the bag is 0.7 or 70%. This means that if a coin is selected at random from the bag, there is a 70% chance that it will not be a one rupee coin.