Directions(Q.11 to Q.15 ):
What will come in place of question mark (?) in the given number series?
7 25 61 115 ? 277
Answer : Option B
Explanation : The pattern is :
7 + 18 × 1 = 7 + 18 = 25
25 + 18 × 2 = 25 + 36 = 61
61 + 18 × 3 = 61 + 54 = 115
115 + 18 × 4 = 115 + 72 = 187
187 + 18 × 5 = 187 + 90 = 277
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