Question

Hey mate ,
Class 10th maths ,

❌No spams , no answers like I don't know or anything else!!!!!❌ otherwise I will report ....
Brainliest to the best explanation !!!!​

Answer 1

Answer:

44550

Step-by-step explanation:

110,121,132......990 are the three digit number divisible by 11

an=a+(n-1)d

990 = 110 + (n-1) 11

880= (n-1) 11

80 =n-1

n=81

S81 =n/2× (a+an)

S81 = 81/2× (110+990)

S81 =81/2 ×1100

S81=81×550

S81= 44550

Answer 2

Step-by-step explanation:

hiiiiii mate,

see photo carefully...

hope this helps you...

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