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SSC CGL Model Paper 19

Question : 12 of 100

Marks: +1, -0

\begin{array}{c c c} 7 & 9 & 11 \\ 11 & 7 & 19 \\ 155 & 127 & ? \end{array}

Solution:

Concept:

The bottom number is obtained by multiplying the two numbers above it, then doubling and adding

1

Explanation:

For the first column:

7 \times 11 = 77

Then,

77 \times 2 + 1 = 155

This matches the given value.

For the second column:

9 \times 7 = 63

Then,

63 \times 2 + 1 = 127

This also matches the given value.

Apply the same rule to the third column:

11 \times 19 = 209

Then,

209 \times 2 + 1 = 419

Answer:

419

(Option A)

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