The probability of rolling 7 or 11 2 or more times in 10 rolls P is the same as 1-probability of rolling 7 or 11 less than 2 times in 10 rolls.

This is equal to 1-(probability of rolling 7 or 11 zero times +probability of rolling 7 or 11 one time)

The binomial distribution is the best tool to compute the probability of rolling 7 or 11 x times

Probabilitiy of rolling a 7 or 11 one time out of 10 rolls=

and the probability of rolling a 7 or 11 zero times out of 10 rolls=

Search google for the binomial distribution if you're still confused