1.

The diagram and the numbers/letters follow certain principle. Select the missing number/ letter indicated by question mark? 6, 7, 10, 8, 16, 15, 26, 23, 42, 38, 68, ___? (A) 61 (B) 80 (C) 106 (D) 120

Answer»

(A) 61

Sol:

 6, 10, 16, 26, 42 68 

7 8 15 23 38 

7 + 8 = 15 

8 + 15 = 23 

15 + 23 = 38 

23 + 38 = 61



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