The sum of first 20 odd natural numbers is
A. 100
B. 210
C. 400
D. 420
Answers
Answered by
2
Answer:
400
Step-by-step explanation:
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39=400
Answered by
4
We know that odd natural numbers are 1, 3 , 5 ……….
a = 1, d = 3 - 1 = 2
By using the formula ,Sum of nth terms , Sn = n/2 [2a + (n – 1) d]
Sn = n/2 [2(1) + (n -1) 2]
Sn = n/2 [2 + 2n – 2]
Sn = n/2 × 2 [1 + n – 1]
Sn = n [ n ]
Sn = n²
sum of first 20 odd natural numbers = 20² = 400
Hence, the sum of first 20 odd natural numbers is 400.
Among the given options option (C) 400 is correct.
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