NET JRF PART - A : Questions and Solutions : NET DEC-2014

NET JRF PART - A : Questions and Solutions:

NET DEC-2014

1.) What is the next number of the following sequence? 

2, 3, 4, 7, 6, 11, 8, 15, 10, …… 

(a) 12 (b) 13 (c) 17 (d) 19 

Ans. : (d) 19 .

Solution:   

The given series is a mixture of two arithmetic series .

The two arithmetic series are :

2, 4, 6, 8, 10,..... and 3, 7, 11, 15, 19,..... 

The first series is a series of even numbers which has a difference of 2 between the two numbers.

The second series is a series of odd numbers which has a difference of 4 between the two numbers.

Hence the next number of the sequence is 19 .