find the sum of all natural numbers between 11 to 30 include them
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Answer:
Sum of all natural numbers between 11 and 30 = 410
Step-by-step explanation:
Numbers between 11 and 30 are in A.P: 11 ,12...30
a= 11; an= 30; d=1
a+(n-1)d= an
=>11 + n - 1= 30
=>n =31-11
=>n = 20
Sn= n/2(a + an)
S20= 10(11+30)
S20= 110 + 300
S20= 410
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