Sum of first hundred numbers common to the two A.P.’s 12, 15, 18, … and 17, 21, 25 …..is
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0
Answer:
61500
Step-by-step explanation:
a=21
d=1
Sn=n/2(A2+(n-1)d)
=100/2(2×21+(100-1)12)
=50(42+99×12)
=61500
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