Number Series Questions Quizzes Online for EPFO SSA Pre, RRB Scale 1 Pre, IBPS RRB Office Assistant Pre at Smartkeeda

Directions  : What will come in place of question mark (?) in the following series?
1
320     160      240      600      2100     ?
» Explain it
C
Series Pattern  Given Series  
320 320  
320 × 1/2 = 160 160  
160 × 3/2 = 240 240  
240 × 5/2 = 600 600  
600 × 7/2 = 2100 2100  
2100 × 9/2 = 9450 9450

Hence, option (C) is correct.
2
432     443      463      500      562     ?
» Explain it
B
Series Pattern  Given Series  
432 432  
432 + (12 + 10) = 443 443  
443 + (32 + 11) = 463 463  
463 + (52 + 12) = 500 500  
500 + (72 + 13) = 562 562  
562 + (92 + 14) = 657 657

Hence, option (B) is correct.
3
13     24      92      546      4360     ?
» Explain it
D
Series Pattern  Given Series  
13 13  
13 × 2 – 2 = 24 24  
24 × 4 – 4 = 92 92  
92 × 6 – 6 = 546 546  
546 × 8 – 8 = 4360 4360  
4360 × 10 – 10 = 43590 43590

Hence, option (D) is correct.
4
23     25      30      40      57     ?
» Explain it
D
Series Pattern  Given Series  
23 23  
23 + (12 + 1) = 25 25  
25 + (22 + 1) = 30 30  
30 + (32 + 1) = 40 40  
40 + (42 + 1) = 57 57  
57 + (52 + 1) = 83 83

Hence, option (D) is correct.
5
25     45      95      185      375     ?
» Explain it
A
Series Pattern  Given Series  
25 25  
25 × 2 – 5 = 45 45  
45 × 2 + 5 = 95 95  
95 × 2 – 5 = 185 185  
185 × 2 + 5 = 375 375  
375 × 2 – 5 = 745 745

Hence, option (A) is correct.