The pattern in this series involves alternating between a single number increase and a jump of multiple numbers. The series starts with 2, then increases by 1 to 3, jumps by 7 to 10, increases by 2 to 12, increases by 1 to 13, jumps by 7 to 20, and so on. Following this pattern, the next number in the series would be 40.
Please check your bill again. There are 1950 A and 1950 C $10 bills but they're different. The series letter is next to the date; any other letter isn't a series letter. Neither one is rare, though. As of 03/2012 they would retail for $12 to $15 in averaged condition.
Please check your bill again. "A" is the highest series letter for 1963 $10 bills. You may be looking at the Federal Reserve District letter instead; the series letter if any is next to the date. You can also check the question "What is the value of a 1963 US 10 dollar bill?" for more information.
That series doesn't exist - series letters for 1934 $10 Federal Reserve Notes only go up to D. You're probably looking at the Federal Reserve District indicator which appears in a large circular seal. The series letter is next to the date. In any case these bills don't command a high premium despite their date because so many were printed. In average circulated condition they retail for $12 to $20 regardless of series letter.
AnswerMost $10 bills dated 1969 are worth a small to moderate premium based on their condition and series letter. In average condition they sell for about $12 to $15; uncirculated ones go for $18 or so. If there is a small letter "B" next to the date they can be worth somewhat more.
In spite of its age, a 1969 $10 bill is common among collectors. As of 11/2010, values are around $12 for a circulated bill and $17-18 for an uncirculated one, regardless of the series letter.
10
What would be the next number in this series 15 12 13 10 11 8?
10 ten
10.
The number that comes next in the series 1 2 2 5 3 10 is 7. You get this number by subtracting the number 3 from the number 10.
10 thought it was 108
12
11
The next number in the series 4, 12, 6, 12, 36, 18, 36
12,7,13,8 etc
24
How about 3 followed by 12