Quantitative Aptitude: Number Series Set 121

Directions (1-10): Find the wrong term in the following series each of which follows some particular pattern:

1. 22 .., 220.., 11.., 330.., 8.35
   22
   220
   11
   330
   8.35
   Option E
   22*10=220
   220/20=11
   11*30=330
   330/40=8.25 (not 8.35)
   
   
    



2. 16.., 21.., 52.., 161.., 704
   16
   21
   52
   161
   704
   Option D
   (16*1) + 5=21
   (21*2)+10=52
   (52*3) +15=171
   (171*4)+20=704
   
   
    



3. 225…, 223.., 167.., 119.., 81.., 43
   225
   223
   167
   119
   81
   Option E
   (15^2+1)-3=223
   (13^2+3)-5=167
   (11^2+5)-7=119
   (9^2+7)-9= 79( not 81)
   (7^2 + 5)-11=43
   
   
    



4. 10.., 40.., 480.., 30730…, 7864320
   10
   40
   480
   30730
   7864320
   Option D
   10 * 4=40
   30* 42=480
   480* 43=30720 (not 30730)
   30720* 44=7864320
   
   
    



5. 1. 5 .., 3.., 5.5.. , 9.., 13.5
   1.5
   3
   5.5
   9
   13.5
   Option C
   1.5*2=3
   3*1.5=4.5 (not 5.5)
   4.5*2=9
   9*1.5=13.5
   
   
    



6. 4.., 12.., 56..,224..,230
   4
   12
   56
   224
   230
   Option E
   4+8=12
   12*4=48
   48+8=56
   56*4=224
   224+8=232
   
   
    



7. 310.., 311.., 323.., 336.., 380
   310
   311
   323
   336
   380
   Option E
   310-9+10=311
   311-8+20=323
   323-7+30=346 (not 336)
   346-6+40=380
   
   
   
    



8. 12.., 1 8.., 20.., 42.., 46.., 66
   12
   18
   20
   42
   46
   Option E
   (12*1)+6=18
   (12*2)-4=2 0
   (12*3)+6=42
   (12*4)-4=4 4 (not4 6)
   (12*5)+6=66
   
   
    



9. 1.5.., 7.5.., 1.5.., 3.75.., 1.25.., 2.625
   1.5
   7.5
   3.75
   1.25
   0.75
   Option E
   1.5 *5 =7.5
   7.5/5=1.5
   1.5*2.5=3.75
   3.75/5=0.75 (not 1.25)
   0.75*3.5=2.625
   
   
    



10. 16.., 30.., 41.., 50.., 63.., 74
    16
    30
    41
    50
    63
    Option D
    16+4+10=30
    16+5+20=41
    16+6+30=52(not 50)
    16+7+40=63
    16+8+50=74