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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 6 4 x 5.75 9,

Then, (x²-1) = ?

A 7.20 Correct Answer Incorrect Answer
B 6.45 Correct Answer Incorrect Answer
C 5.25 Correct Answer Incorrect Answer
D 3.92 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

6 × 0.5 + 1 = 4 4 × 1 - 1.5 = 2.5 2.5 × 1.5 + 2 = 5.75 5.75 × 2 - 2.5 = 9 Hence, x = 2.5 Hence, (2.5)² - 1 = 6.25 -1 = 5.25

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