Question

which is the largest of the seven sister state of Northeast India

Answer 1

According to census 2011,,
Largest state in seven states is ASSAM according to population wise
And
Largest state in seven states is ARUNACHAL PRADESH according to area wise

Answer 2

Hey there!

Q. Which is the largest of the seven sister states of Northeast India?

(a) Assam

(b) Mizoram

(c) Arunachal Pradesh

(d) Tripura

Answer : Option (c) Arunachal Pradesh

Extra information :

-- The Northeastern India comprises seven states often known as "seven sisters" named as :

1. Arunachal Pradesh.
2. Assam.
3. Manipur.
4. Meghalaya.
5. Mizoram.
6. Nagaland.
7. Tripura.

-- The seven sisters of Northeast India also known as "Paradise Unexplored".

-- The reason behind they called  seven sisters because of the similarity between the states, in terms of geographical location of all seven states in the same region, and interdependence between them or may be cause of these states covers an area of $255,511km^{2}$ that means it covers about 7 percent of India's total area.

-- By area - wise i.e. $83,743km^{2}$ Arunachal Pradesh is the largest state in the North - East Region.