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Let a n be n th term of the series 5 + 8 + 14 + 23 + 35 + 50 + ......... and S n = ∑ = n 1 k k . a Then S 30 – a 40 is equal to

1. 11310
2. 11260
3. 11290
4. 11280

Correct answer: 11290

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