Q.10) What is the sum of averages of first 30 natural numbers and first 20 natural numbers ?
explain STEP BY STEP
Answers
Answered by
3
- Sum of first 30 natural numbers:
- = 15(2+29)
- = 15(31)
- = 465
- Sum of first 20 natural numbers
- = 10(2+19)
- = 10(21)
- = 210
= 15.5
= 10.5
- Sum of Averages = 10.5+15.5
- = 26
Answered by
7
First 30 natural numbers = 1, 2, 3, 4, ....... ,30
The series is in an AP with,
First term (a) = 1
Last term (l) = 30
Common Difference (d) = 1
Again,
First 20 natural numbers = 1, 2, 3, 4, ....... , 20
The series is in an AP with,
First term (a) = 1
Last term (l) = 20
Common Difference (d) = 1
Sum of average of first 30 natural numbers and first 20 natural numbers
= (15.5 + 10.5)
= 26
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