Find the sum of the first 28 multiples of 5.
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Answer:
Sum of the first 28 multiple of 5 is 1730.
Step-by-step explanation:
Given:
a=5
d=5
n=28
To find:
Sn=?
solution:
Sn=n/2{2a+(n-1)d}
Sn=28/2{2×5+(28-1)5}
=14×145
=1730
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