NTSE Stage 2 MAT 2018 Exam Question Paper

Question : 49 of 100

Marks: +1, -0

What is the number in place of ‘?’ ?
2Y23, 3V19, 5V17, 7T13, 11V11, ?

13T7
13V9
13W9
13U7

Solution:

Number :

1st number of each term is forming a series of prime number in increasing order.
∴Next number = 13
Last number of each term is also forming a series of prime number is decreasing order.
∴ Next number = 7
And middle letter (number) = Sum of 1st & 3rd number.
⇒Middle term (letter)

=(13+7=20)

⇒ T
∴ 13 T 7 ⇒ Option 1 is correct.

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