3. Find the sum of all even numbers from 1 to 350.
Answers
Answered by
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30800
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Answered by
0
Answer:
30625
Step-by-step explanation:
l =a+(n_1)d
l=350
a=1
d=4_ 2 = 2
n=?
350=1+(n_ 1)2
350÷2=1+(n_ 1)
175=1+(n_ 1)
n =175
sn = n/2(2a+(n_ 1)d)
= 175/2(2×1+(175_1)2
=175/2×350
=175×175
=30625
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