Sum of the seventeen numbers

The sum of the 17 different natural numbers is 154. Determine the sum of the two largest ones.

Correct result:

s =  34

Solution:

a1=1 d=1 n=17 a17=a1+d⋅ (n−1)=1+1⋅ (17−1)=17 s17=a1+a172⋅ n=1+172⋅ 17=153  s1=1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+18=154   s=16+18=34

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