Q: What number is missing from the sequence 1 7 19 25?

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Each part equals -19. 0-19=-19, 4-23=-19,...so 25-X=-19. This means 25+19=X, so the missing number is 25+19 which is 44.

22

The answer will depend on where in the sequence the missing number is:Using only quartic polynomials, the solutions are:3, 10, 25, 54, 10310, 11.75, 25, 54, 10310, 25, 33.8333..., 54, 10310, 25, 54, 84.25, 10310, 25, 54, 103, 178.Other functional forms will generate many more answers.

The missing numbers are 9 & 49.The sequence is 1x1, 2x2, 3x3, 4x4, 5x5, 6x6, 7x7& 8x8.

This sequence is an interlace of two sequences: 13,17,21,25,29,33,..(each number 4 higher than the previous one) and 10, 15, 25,30,35(each number 5 more than the previous one). So the sequence continues 30,29,35,33,...

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Each part equals -19. 0-19=-19, 4-23=-19,...so 25-X=-19. This means 25+19=X, so the missing number is 25+19 which is 44.

22

The answer will depend on where in the sequence the missing number is:Using only quartic polynomials, the solutions are:3, 10, 25, 54, 10310, 11.75, 25, 54, 10310, 25, 33.8333..., 54, 10310, 25, 54, 84.25, 10310, 25, 54, 103, 178.Other functional forms will generate many more answers.

9 (between 8 and 16).

The missing numbers are 9 & 49.The sequence is 1x1, 2x2, 3x3, 4x4, 5x5, 6x6, 7x7& 8x8.

6

39

This sequence is an interlace of two sequences: 13,17,21,25,29,33,..(each number 4 higher than the previous one) and 10, 15, 25,30,35(each number 5 more than the previous one). So the sequence continues 30,29,35,33,...

They are 25 and 49

The amount between each number doubles. Between 16 and 19 = 3 Between 19 and 25 = 6 Between 25 and 37 = 12 Between 37 and 61 = 24 Therefore, the next in the sequence would be: 109

Ascending terms in the sequence are equal to 12, 32, 52, __, 92, and, for some reason, 102, not 112. Therefore, assuming the last term in the sequence to be 112 = 121, the fourth term in the sequence is 72 = 49.

The missing number is 18