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, 2x²+ 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 + 9 = 16 16 + 25 = 41 41 + 49 = 90 90 + 81 = 171 171 + 121 = 292 Hence, x= 41 Hence, (2 × 41²) + 1 + 41 = 3362 + 1 + 41 = 3404

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