find find the sum of first 20 multiples of fight between 99 and 999
girishnaik315pedmq6:
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tq
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Answered by
1
The multiply of 20 lies between 99 to 999 are
=100,120,140.......980.
So,
a=100,d=20 and l=980
Sn=n÷2{2a+(n-1)d
20=20÷2×{2×100(19)20
20=10×(200+380)
20=10×580
20=5800ans.
Answered by
0
the answer is 2950 mate. hope you like it
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