binomial theorem

[red oxide]

would the coefficient of x to the power of -3 be 35???

[vocal storm]

No.

[red oxide]

then?

[vocal storm]

...it's 7C3.

[red oxide]

what does that mean ?

7C3

[vocal storm]

nCm = n!/(m! * (n - m)!)

[red oxide]

k

[vocal storm]

Wait.

[red oxide]

ok

[vocal storm]

7C3 = 35.

Okay, sorry.

[red oxide]

ye

[vocal storm]

You were right.

[red oxide]

oh k

[vocal storm]

Although.

Technically it should be -35.

Since you're taking (-1/x) to an odd power.

[red oxide]

kk

thanks man

i really appreciate it

can u help me with one more thing??

[vocal storm]

What's up?

[red oxide]

what does the second term mean in this qs

[vocal storm]

"Second term"?

[red oxide]

ye

it said to find the coefficient of the second term of (x-3y) to the power of 5

[vocal storm]

That's... the term after the first term?

[red oxide]

so is the ans 1?

so is the second term -3y and the coefficient 1?

[vocal storm]

No.

[red oxide]

oh

[vocal storm]

The second term of the expansion.

[red oxide]

oh

so -15

?

[vocal storm]

Yeah.

[red oxide]

right

ok

i missed the class on binomial theorem lol

many thanks man