Find the some 20
to 30 all numbers
Answers
Answered by
1
Answer:
The composite numbers between 20 and 30 are: 20, 21, 22, 24, 25, 26, 27, 28, and 30. All the numbers between 20 and 30 are 20, 21, 22, 23, 24, 25,...
Answered by
1
Answer:
275
Step-by-step explanation:
Here series 20,21,22,23,…….30 is Arithmetic progression because common difference is 1 .
So first term a=20, & Last term = 30
Total number of terms in the series is 11.(when series is lengthy then use to find out the total number in series is Tn=a+(n-1)d where d= common difference)
So, Sum =n/2(a+l)=11/2(20+30)=275
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