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Find the missing number

17, 33, 70, 131, 278 ? 

(1) 581 

(2) 531 

(3) 541 

(4) 575

1 Answer

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Best answer

Correct option is (2) 531

17, 33, 70, 131, 278 

17 → 17 x 2 - 1= 34 – 1 = 33 

33 → 33 x 2 + 22 = 66 + 4 = 70 

70 → 70 x 2 - 32 = 131 

131 → 131 x 2 + 42 = 278 

∴ 2 x 278 - 52 = 531

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