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Find the value that should come in place of (?) in the series: 4, 5, 12, 39, ?, 805

Competition practiceNumber Series

A160
B156
C164
D152

Step-by-Step Solution

The rule is

\times 1 + 1, \times 2 + 2, \times 3 + 3, ... : 39 \times 4 + 4 = 160

, and

160 \times 5 + 5 = 805

checks.

Answer: A) 160

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