NUMBER SERIES ASKED IBPS RRB CLERK 2017 PRELIMS EXAM ALL SHIFT – 17th SEPTEMBER 2017


NUMBER SERIES ASKED IBPS RRB CLERK 2017 PRELIMS EXAM 1st SHIFT – 17th SEPTEMBER 2017

1 ) 6, 8, 13, 23, ?, 56

2 ) 7, 8, 18, 57, 232 ,?

3 )  8, 5 , 6, 10, 21, ?

4 ) 4, 18, 46, 102, ?, 438

5 )  109, 110, 102, 129, 65, ?

Solution :

1 ) +2…..+5……+10…..+17……+26

+3……+5……..+7……+9

2 ) x1+1…..x2+2……x3+3……x4+4

3 ) x0.5+1….x1+1…..x1.5+1……x2+1

4 ) +14…..+28….+56….+112 (Double)

5 ) +1….-8……+27……-64….+125 (Cube)

NUMBER SERIES ASKED IBPS RRB CLERK 2017 PRELIMS EXAM 2nd SHIFT – 17th SEPTEMBER 2017

1 ) 7, 7, 10, 18,  ?, 57

2 ) 7, 8, 16, 43, 107,  ?

3 ) 98, 111, 85, 137, ?, 241

4 ) 6, 5, 8, 21, 80,  ?

5 ) 10, 4, 3, 3.5, 6,   ?

Solution :

1 ) +0…..+3….+8……+15

2 ) +1….+8…..+27….+64….+125

3 ) +13……-26…..+52…..-104

4 ) x1-1…..x2-2…..x3-3……x4-4

5 ) x0.5-1…..x1-1…..x1.5-1……x2-1

NUMBER SERIES ASKED IBPS RRB CLERK 2017 PRELIMS EXAM 3rd SHIFT – 17th SEPTEMBER 2017

1 )  7, 6, 10, 36, 280, ?

2 ) 6, 4, 77, 294, 806, ?

3 ) 4, 7, 16, 43, 124, ?

4 ) 69, 67, 62, 52, ?

5 ) 13, 7, 8, 13.5, 29, ?

Solution :

1 ) x1-1….x2-2….x4-4…..x8-8

2 ) +8…..+64……+216….+512 (difference – Cubes of 2,4,6,8,10)

3 ) +3…+9….+27….+81….+243

4 ) +2…..+5……+10…..+17

+3……+5……+7
5 ) x0.5+0.5…..x1+1….x1.5+1.5……x2+2

As the exam is of Easy to Moderate level and due to less number of vacancies, the Overall Good Attempts for IBPS RRB Clerk Prelims will be : 68-72