IBM Company Logical Reasoning Number Series

I use some logic here but cant assure this. so guyz plz solve these.
1> 1, 3, 3, 2, 8, 10, 3, 4, 12, 4, 8, ? (Is it 21?)
2> 9, 12, 4, 8, 12, 15, 5, 9, 3, 6, 2, 6, 6, 9, ?
3> 15 3/4, 16, 26, 9 1/5, 9, 19, 64 2/3, 65, 75, 30 3/8, ?
4> 3/2, 2 1/4, 9/4, 7/2, 12 1/4, 49/4, 4/3, 1 1/7, 16/9, ?
5> 2,6,5,14,11,26,17,?
6> 7776,625,64,9,?

Read Solution (Total 11)

IBM Other Question

cn u plz tell me the criteria for ibm off campus...is it 65% throughout....i have gt 80% in 1oth and 12th..nd i hv 69% in b.tech..am i eligible?plz help me In a group there are two kinds of people type A & type B.type A people answer for any question as YES & that of type B as NO. If they can not answer to these question then they remain silent. the mayor asks question to them as follows........
(1) If he asks a person are u type A
a. YES
b. NO
c. Silent
d. Can not be determined
(2) He asks two persons X &Ysimultaneously whether u of same type a. YES
b. NO
c. YES or NO
d. Silent
e. can not be determined
(3) Pointing to a person X he asks Y what is his type
a. YES
b. No
c. Silent
d can not be determined
(4) Pointing to a person X he asks Y if I ask him whether r u type A will he answer YES.Y says NO .what type of B is
a. YES
b. NO
c. Silent
d. can not be determined