Find a recursive formula

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Easy

Find the recursive formula for the sequence: 4, 6, 8, 10, ...

0.a_1=4, a_n=a_{n-1}+2

1.a_1=4, a_n=a_{n-1}-2

2.a_1=4, a_n=2*a_{n-1}

3.a_1=2, a_n=a_{n-1}+4

Easy

Find the recursive formula for the sequence: 3, 6, 12, 24, ...

0.a_1=3, a_n=a_{n-1}+3

1.a_1=3, a_n=2*a_{n-1}

2.a_1=2, a_n=3*a_{n-1}

3.a_1=3, a_n=a_{n-1}/2

Easy

Find the recursive formula for the sequence: 2, 5, 11, 23, ...

0.a_1=2, a_n=a_{n-1}+3

1.a_1=2, a_n=3*a_{n-1}-1

2.a_1=2, a_n=2*a_{n-1}+1

3.a_1=2, a_n=a_{n-1}+5

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