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134 => 84178 => 78190 => 40290 => ?​

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Answer:

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Step-by-step explanation:

Given:  134 = 84, 178 = 78, 190 = 40

To find: 290 = ???

Solution:

The series FOLLOWS the below technique.

134 = 84

134 - 84 = 50  ⇒ 50 × 1 = 50

178 = 78

178 - 78 = 100   ⇒ 50 × 2 = 100

190 = 40

190 - 40 = 150  ⇒ 50 × 3 = 150

As we can see, the successive subtraction results in multiple of 50. Therefore, the next series subtraction result must be

290 = ???

⇒ 50 × 4 = 200

290 - x = 200

290 - 200 = 90

∴ 290 = 90 is the missing series


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