RRB NTPC 18 January 2017 Paper

Question : 112 of 120

Marks: +1, -0

Find the value of’?' in the following series 6 : 30 :: 7 : ?

Solution:

(4) 6 : 30 : : 7 : ?

n _ { 1 } : n _ { 1 } \( n _ { 1 } - 1 \) : : n _ { 2 } : \( n _ { 2 } - 1 \)

= 6 : 6 × 5 : : 7 : 7 × 6 = 6 : 30 : : 7 :42

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