Answer:
207
Explanation:
The sum to n terms of an arithmetic sequence is
= [ 2a₁ + (n - 1)d ]
where a₁ is the first term and d the common difference
Here a₁ = 37 and d = 34 - 37 = - 3 , thus
= [ (2 × 37) + (17 × - 3) ]
= 9( 74 - 51)
= 9 × 23
= 207
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= 
[ 2a₁ + (n - 1)d ]
= 
[ (2 × 37) + (17 × - 3) ]