find the sum of all even number between 13 to 70
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Step-by-step explanation:
The required AP is 14,16,...,68
Now, T=68, where a=14, d=2
=>14+(n-1)2=68
=>(n-1)2=54
=>n=27+1=28
Required sum= n/2(a+l)
=28/2(14+68) =14* 82 = 1148
Sum of all even numbers between 13 and 70 is 1148.
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