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Let I(x) = ∫ + − 13 15 13 11 ) 15 x ( ) 11 x ( dx . If I(37) – I(24) = ⎟ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎜ ⎝ ⎛ − 13 1 13 1 c 1 b 1 4 1 , b, c ∈ N, then 3(b + c) is equal to-

1. 40
2. 39
3. 22
4. 26

Correct answer: 39

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