A bag contains 6 red and 4 blue marbles. Two marbles are taken at random without replacement. Find the probability that both are red.

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The first term of an arithmetic sequence is $4$ and the common difference is $3$ . Find the 12th term.
The first term of an arithmetic sequence is $7$ and the common difference is $5$ . Find the 10th term.
The first term of an arithmetic sequence is $2$ and the common difference is $6$ . Find the 15th term.
The first term of an arithmetic sequence is $10$ and the common difference is $4$ . Find the 9th term.
The first term of an arithmetic sequence is $3$ and the common difference is $8$ . Find the 11th term.
The first term of an arithmetic sequence is $5$ and the common difference is $2$ . Find the 20th term.