Find the next number in the series: 5, 7, 11, 13, 17 ? 

A  21 

B  19 

C  15 

D  9 

Solution

Correct Answer: Option B

Solution: 

 5 + 2 = 7    7 + 4 = 11   11 + 2 = 13 
 13 + 4 = 17    17 + 2 = 19    2, 4, 2, 4 ..... এভাবে বেড়েছে  

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