5+13+21+......+181=.......
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Answered by
2
Answer:
a = 5
d = 8
an = 181
an = a + (n - 1) d
181 - 5 / 8 = n-1
176/8 = n -1
22+ 1 = n
n = 23
=> Sn = n/2 ( a + an)
=> S23 = 23/2 × ( 5 + 181)
=> S23 = 23/2 × 186
=> S23 = 23 × 93
=> S23 = 2139
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0
Step-by-step explanation:
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