If the mean of a,b,c is M and ab+bc+ca=0        then the mean of a^2,b^2,c^2 is:

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#Question id: 6584

#General Aptitude

find the missing letter

A    ?   Q    E

C    M   S    C

E    K    U   A

G    I    W   Y

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#Question id: 6585

#General Aptitude

Find the missing letter              

A	B	C	D
F	I	L	O
K	P	U	Z
P	W	D	?

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#Question id: 6588

#General Aptitude

26	18	10
11	9	7
5	4	1
10	5	?