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Let an be the nth term of the series 5 + 8 + 14 + 23 + 35 + 50 +.... and Sn

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Let an be the nth term of the series 5 + 8 + 14 + 23 + 35 + 50 +.... and Sn = \(\displaystyle\sum_{k=1}^{n} a_k.\) Then S30 - a40 is equal to 

(1) 11260 

(2) 11280 

(3) 11290 

(4) 11310

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Correct option is (3) 11290 

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