allery2, ?, 12, 20, 30 માં એક પદ છુપાયેલું છે. તે છુપાયેલી સંખ્યા કઈ છે?
A6
B8
C4
D10
Answer & Solution
Correct answer: A. 6
પદો n x (n + 1) અનુસરે છે: 1x2, 2x3, 3x4, 4x5, 5x6, તેથી બીજું પદ 6 છે.
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