What number will replace the ?
$4, 9, 19, 34, 54, ?, 109$

89

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84

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74

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79

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Solution

The correct option is D $79$
The difference between two terms is of the form +5, +10, +15, +20, +25, +30.
$9 - 4 = 5$
$19 - 9 = 10$
$34 - 19 = 15$
$54 - 34 = 20$
$79 - 54 = 25$
So, option D is the correct answer.

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