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Question

In each of the following questions a number series is given.  One term of the series is denoted by 'x' . You have to calculate the value of  'x' and by using the value of  'x' ,  you have to replace the question mark (?) in the following questions :

If 7               16        x        90        171           292

Then,  2x 2 +   1 + x   = ?

A 3380 Correct Answer Incorrect Answer
B 3750 Correct Answer Incorrect Answer
C 3563 Correct Answer Incorrect Answer
D 3404 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

7 + 32 = 16 16 + 52 = 41 41 + 72 = 90 90 + 92 = 171 171 + 112 = 292 Hence, x= 41 Hence,  (2×x2   + 1 + x) =  (2×412   + 1 + 41)  = 3362 + 1 + 41 = 3404

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