## Multinomial theorem - Basic

Compared to other sections, Mathematics is considered to be the most scoring section. If prepared thoroughly, Mathematics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The coefficient of x3 in the expansion of (1-x+x2)5 is

•  10
•  – 20
•  – 50
•  – 30

– 30

Q2. The coefficient of a8b6c4 in the expansion of (a+b+c)18 is

•  18C14.14C8
•  18C10.10C6
•  18C6.12C8
•  18C4.14C6

18C14.14C8

Q3. The coefficient of x3.y4.z in the expansion of (1+x+y-z)9 is

•  2.9C7.7C4
•  -2.9C2.7C3
•  9C7.7C4
•  None of these

-2.9C2.7C3

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