To find the number of terms:

the smallest integer greater than equal to 295 that is divisible by 30, i.e. 300

the greatest integer smaller than equal to 615 that is divisible by 30, i.e. 600

It becomes an evenly spaced set: {300, 330, 360, 390, 420, 450, 480, 510, 540, 570, 600}

Number of terms in an evenly spaced set

(Last term-First term)/(Common Difference)+1

(600 - 300 )/30 + 1 = 11

Average= (First Term+Last Term)/2

Sum=Number of terms*Average

=> 11* ( 300 + 600) / 2

=> 11 * 450

=> 11 * 2 * 3^2 * 5^2

Clearly Highest prime=11

Ans: "C"

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