 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?
Important for :
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.