Q.2 Write the answer in one word / sentence:
1. Highest power of the variable in linear equation is ?
2. Point (3,-2) is situated in which quadrant ?
3. Arithmetic mean of 2,3 and 4 is ?
Answers
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1
Answer:
1. one
2. This point is on the 3rd quadrant.
⇒ 3.This is an AP, with the initial term a=1 and the common difference d=1.
∴ The sum of n terms of an AP is given by,
⇒ S
n
=
2
n
[2a+(n−1)d]
⇒ S
n
=
2
n
[2×1+(n−1)×1]
⇒ S
n
=
2
n
[2+(n−1)]
⇒ S
n
=
2
n
[n+1]
→ Arithmetic mean of n numbers a
1
,a
2
,a
3
,a
4
,...a
n
is given by the formula
⇒
n
a
1
+a
2
+a
3
+a
4
+...+a
n
⇒
n
S
n
⇒
n
2
n
[n+1]
∴
2
n+1
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