(61 + 62 + 63 + ......... +110) = ?
A) 4275 B) 8550 C) 12825 D) 17100
Answers
Answered by
0
Answer:
4274
Step-by-step explanation:
because when we add all the consecutive numbers from 61to110is 4724
Answered by
0
Step-by-step explanation:
This sequence forms an A.P with common difference 1
Therefore, an = a + (n - 1)d
Where, an = nth term
a = first term
n = number of terms
d = common difference
Applying the formula, we get,
110 = 61 + (n - 1)
n = 50
Therefore, Sn = n (a + l)/2
Where, Sn = sum of nth terms
n = number of terms
a = first term
l = last term
Now, applying the formula and obtain the sum
S = 50(61 + 110)/2
S = (50 × 171)/2
S = 4275
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