Answer:
the best number is 17 cuz the sequence is to add 2 sooo it's 17 then 19
2n+5
Explanation:
Sequence = 7,9,11,13,15 ....
tn = a + (n-1)d where a is first number, and d is common difference
tn = 7 + (n-1)2
= 7 + 2n - 2
= 2n+5
therefore tn (or nth term rule) = 2n+5
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