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Question

If |z11|<1,|z22|<2,|z33|<3, then |z1+z2+z3|

A
is less than 6
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B
is more than 3
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C
is less than 12
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D
lies between 6 and 12
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Solution

The correct option is C is less than 12
|z11|<1
1<z11<1
1+1<z1<1+1
0<z1<2

|z22|<2
2<z22<2
2+2<z2<2+2
0<z2<4

|z33|<3
3<z33<3
3+3<z3<3+3
0<z3<6

z1+z2+z3<2+4+6
z1+z2+z3<12
|z1+z2+z3|<12

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