Question

13,50,?, 244,425,678,1015​

Answer 1

Given : 13   50   ?   244   425   678  1015

To Find :  Missing Number

Solution:

13   50   ?   244   425   678  1015

 

13

13 + 12*3 + 1  =  50

50 + 12*6 + 1  = 123

123 + 12*10 + 1  = 24

244 + 12*15 + 1  = 425

425 + 12*21 + 1 =  678

678 + 12*28 + 1  = 1015

Logic is

Tₙ = Tₙ₋₁  + 12 (ⁿ⁺¹C₂) + 1     T₁ = 13

Missing number  is 123

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