Question

In each of the following questions the number series is given. One term of the series is denoted by x. You have to calculate of value of x and by using the value of x, you have to solve the following questions.

If   4       10    16      26       x     50

Then find the value of (x² - 1) + (x² + 1).

A 2582 Correct Answer Incorrect Answer
B 2592 Correct Answer Incorrect Answer
C 2492 Correct Answer Incorrect Answer
D 2952 Correct Answer Incorrect Answer
E 2855 Correct Answer Incorrect Answer

Solution

2 ² = 4 3² + 1 = 10 4² = 16  5² + 1 = 26 6² = 36            7² + 1 = 50  Then, (x² - 1) + (x² + 1) ⇒ (36² - 1) + (36² + 1) ⇒ (1296 – 1) + (1296 + 1) ⇒ 1295 + 1297 = 2592

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