Amazon Interview Question Software Engineer in Tests
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expression= z * (x + (x+1) + (x+2).......+y)
- (Chris) Gayle (VVS) Laakmann December 07, 2009= z * (x + (x+1) + (x+2).......+ (x + (y-x)) )
= z * ( (x + x + x......(y-x+1 times)) + (1 + 2 + 3 .....+ (y-x)) )
= z * ( x * (y-x+1) + ((y-x)*(y-x+1)/2))
= z * (y-x+1) * (x + (y-x)/2)
= z/2 * (y-x+1) * (x + y )
Much easier to plug in the values and test the code from here