CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
Question

What is the sum of the series (15+252+353)+(154+255+356)+........ to 7 terms?

Open in App
Solution

Let S=(15+252+353)+(155+255+356)+.........
=(15+154+157+.......)+(255+255+258+....)+(353+356+359+.......)
=15(1+153+156+......)+252(1+153+156+.......)+353(1+153+156+.......)
=(15+252+353)(1+153+156+.......)
=25+10+3125×1(1153n)1153 [Sum of G.P ]
=38125×125124(1153n)
Putting n=7,5=38124(11521)0.3064.

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Properties of GP
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon