Find the missing term in the sequence
15, 25, 40, 130,(?), 2560

520

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490

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480

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None of these

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Solution

The correct option is D
None of these

15 25 40 130? 2560

The series is : 15 $\times$ 1 + 10 = 25

25 $\times$ 2 - 10 = 40

40 $\times$ 3 + 10 = 130

130 $\times$ 4 - 10 = 510

510 $\times$ 5 + 10 = 2560

Hence option (5) is the answer.

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