Sum of first 100 nos. common to the two A.P.s 12,15,18... and 17,21,25...
Answers
Answered by
1
Answer:
n (n+1)/2
Step-by-step explanation:
100 (100+1)/2
100 (101)/2
50×101
5050
Answered by
5
Answer:
10650
Step-by-step explanation:
n= 100
a= 12
d=15-12=3
d=3
sn=?
sn=n/2(2a+(n-1)×d)
sn=100/2(2×12+(100-1)×3)
sn=50(24+99×3)
sn=50(24+ 297)
sn=50×321
sn= 16050
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