Question

What will be the number in place of question mark (?) in the following series? -9, -15,-49, -191. (?),-5759 (a) -861 (b) -961 (c)-976​

Answer 1

Answer:

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Answer 2

Given : -9, -15,-49, -191,  ?  , -5759

To Find :  number in place of question mark

Solution:

-9

-9  * 2 +  3  = -15

-15 * 3  - 4  =  -49

-49 * 4 + 5  = -191

-191 * 5  - 6  = -961

-961 * 6 + 7 = -5759

Hence -961 comes at place of ?

Logic is  

Tₙ  = Tₙ₊₁ * n  + (-1)ⁿ(n+1)    where T₁  = - 9

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