In the following number series, both follow same pattern. What will be the difference between d and a? (i) 777, 778, 787, 812, 861 (ii) 9999, a, b, c, d

 In the following number series, both follow same pattern. What will be the difference between d and a? (i) 777, 778, 787, 812, 861 (ii) 9999, a, b, c, d Correct Answer 83

Considering the series (i)

777, 778, 787, 812, 861

The logic of above series can be explained as,

778 - 777 = 1 = 12

787 – 778 = 9 = 32

812 – 787 = 25 = 52

861 – 812 = 49 = 72

Given that, Series (ii) follows the same pattern,

9999 + 12 = 10000

10000 + 32 = 10009

10009 + 52 = 10034

10034 + 72 = 10083

a = 10000, b = 10009, c = 10034, d = 10083

Difference between d and a = 10083 – 10000

⇒ 83

∴ The required difference is 83

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