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Question

What will come in placer of question mark (?) in the given number series ?


17 9 15 40 143.5 ?

Options:
A .  505.75
B .  578.5
C .  650.25
D .  578
E .  678.5
Answer: Option C

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2 Comments

formula:
2.27083x^4 -12.7917x^3 +29.47917x^2 -26.9583x +17
(0, 17), (1, 9), (2, 15), (3, 40), (4, 143.5)
(5, 439.5)
Ans: 650.25

(17x1+1)/2= 9 (9x3+3)/2= 15 (15x5+5)/2=40 (40x7+7)/2 (143x9+9)/2=650.25

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