Which number replaces question mark in the series 7, 12, 19, ?, 39.

The number that replaces the question mark is 28. The pattern is to add consecutive odd numbers to each term: 7+5=12,12+7=19, 19+9=28, and 28+11=39. • Step 1: Find the difference between the first two numbers: 12−7=5. • Step 2: Find the difference between the next two numbers:19−12=7. • Step 3: Notice that the difference is increasing by 2 each time (5,7,...). The next difference should be7+2=9 • Step 4: Add this new difference to the last number to find the missing term: 19+9=28 • Step 5: Verify by finding the next difference, which is 9+2=11. Add this to 28 to get 39, which matches the last number in the series (28+11=39).