Level 44: Calculate 2 + 4 + 6 + 8 + … + 100.

The given sum has: (100 – 2) : 2 + 1 = 5 (term)

We have:

2 + 4 + 6 + 8 + … + 100

= (2 + 100) +(4 + 98)+…+( 50 + 52) (there are all 50 : 2 = 25 pairs)

= 102.25 = 2550

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Level 44: Calculate 2 + 4 + 6 + 8 + … + 100.

The given sum has: (100 – 2) : 2 + 1 = 5 (term)

We have:

2 + 4 + 6 + 8 + … + 100

= (2 + 100) +(4 + 98)+…+( 50 + 52) (there are all 50 : 2 = 25 pairs)

= 102.25 = 2550

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