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Statement-1: 1+2+3....+n=(n(n+1))/(2),"f...

Statement-1: `1+2+3....+n=(n(n+1))/(2),"for all "n in N`
Statement-2: `a+(a+d)+(a+2d)+....+(a+(n-1)d)=(n)/(2)[2a+(n-1)d]`

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