3से गुणा करके बनी 100 तथा 200 के बीच की सभी पाकृति क संख्या का योग क्या होगा ?
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Answered by
18
The a.p. Is-
102,105,108,.....,198
Here,a=102
d=3
an=198
=>102+(n-1).d=198
=>(n-1).3=96
=>n=96/3+1
=33
S=33/2[2*102+(33-1)*3
=33/2(204+32*3)
=33/2*300
=33*150
=4950...ans//
(Here * means into.)
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