Flag Magical Mathematics[Interesting Approach]> PROGRESSION!!!...
question mark

(1), (2,3), (4,5,6), (7,8,9,10)................... upto m groups

mth group contains m terms................like 1st group conyains 1 term....2nd one contains 2 terms..................................................FIND THE SUM OF THE TERMS IN THE 110 th term ????????? PLS EXPLAIN

Shivam Bhagat , 14 Years ago
Grade 9
anser 2 Answers
Mir Noaman Ali IIT-Roorkee

Last Activity: 14 Years ago

m'th group contains m terms and if u observe ... the last term in the mth group is the sum offrst m natural numbers .... like last term of 1 group is sum of frst natural number =1 last term of 2ndgroup is sum of frst 2 natural numbers =3 .. last term of 3rd group is sum of frst 4 natural numbers =6 .. similarly last term of mth group is sum of frst natural numbers ...... so the last term of 110 th group will be the sum of frst natural numbers .. u have the last term of 110 group.. u have d common difference .. u have number of terms so u can find the frst term .. and now apply sum of n terms in ap formula answer is 665555

iit jee

Last Activity: 14 Years ago

hi,

first group last term =1

second groups last term =1+2

third groups last term=1+2+3

......110 th groups last term =1+2+3+..............+110.

thus you get first and last terms of that group . find the sum .

 

plzzz approve!!!!!!!

 

kedar joshi.

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments