The sum 6

The sum of the 17 different natural numbers is 153. Determine the sum of the two
largest ones.

Correct result:

s =  33


a1=1 d=1 s17=153  a15=a1+14 d=1+14 1=15  s15=15 a1+a152=15 1+152=120  s=s17s15=153120=33

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