Find the sum: 25+28+31+
..+100
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Answered by
2
Answer:
a = 25
d =28 - 25 = 3
an = 100
an = a+( n - 1) d
100 = 25 + (n-1) (3)
100 -25 = (n-1) (3)
75= (n-1) (3)
75/3 = (n-1)
25 = (n-1)
25 +1 = n
26 = n
Sn = n/2 (a +an)
= 26/ 2 ( 25 +100)
= 13 ( 125 )
= 1625
Step-by-step explanation:
Answered by
0
Answer:
The Answer is 184.
It will help you
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