sum of odd numbers 1 to 40
Answers
Answered by
0
Answer:
Formula used:
Sum of odd numbers = [n/2 × (a + l)]
Calculation:
Odd numbers from 1 to 40 can be represented in number series such as:
The number series 1, 3, 5, 7, 9, . . . . , 39.
The first term a = 1
The common difference d = 2
Total number of terms n = 40/2 = 20
Last term l = 39
Applying the A.P. formula
Sum = [n/2 × (a + l)]
⇒ [20/2 × (1 + 39)]
⇒ (10 × 40)
⇒ 400
∴ The sum of odd numbers from 1 to 40 is equal to 400
Answered by
2
Answer:
n=20
step by step explanation:
we know the formula of sum, Sn=n/2{2a+(n-1)d} put the value. 20/2{2*1+(20-1)2}=10{2+38}=400.
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