Which of the following numbers will replace the question mark (?) in the given number series?
25, 115, 214, 322, ?, 565, 700

Let's look at the differences between consecutive terms in the series:
115−25=90

214−115=99

322−214=108

Let's notice the pattern in these first-level differences:
90,99,108,…
The difference between consecutive differences (second-level difference) is:

99−90=9

108−99=9

Following this pattern, the next difference should be:

108+9=117
Thus, the missing number (?) would be:

322+117=439
Let's verify if this holds true for the rest of the series:

Next difference should be: 117+9=126

Next term: 439+126=565 (Matches the given term)

Next difference should be: 126+9=135

Next term: 565+135=700 (Matches the given term)

Hence, the correct answer is 439.