Q.11. Find the sum of first 20 odd natural number.
Answers
Answered by
0
Answer:
here
Step-by-step explanation:
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39
435 is answer
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Answered by
1
Answer:
Answer is 400
Step-by-step explanation:
The first 20 odd natural numbers are given by 1,3,5,7,9……,37,39 and this forms an AP.
a = 1
d = 2
n = 20
The formula of sum of an A.P series
S = n/2[2a + (n − 1) × d]
S = 20/2 [2 × 1 + (20 – 1) 2]
S = 10[2 + 38]
S = 400
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