NTSE Stage 2 MAT 2018 Exam Question Paper

Question : 51 of 100

Marks: +1, -0

What is the number in place of ‘?’ ?
6,15,35, ? , 143, 221

Solution:

6, 15, 35, ?, 143, 221
(2×3), (3×5), (5×7), ?, (11×13), (13×17)
This is a series of multiplication of consecutive prime number.
⇒ Missing number

=7×11=77

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