यदि (f(t)=a+4t) और (f(1), f(3), f(5)) का योग (81) है, तो (a) क्या है?
If (f(t)=a+4t) and the sum of (f(1), f(3), f(5)) is (81), what is (a)?
Explanation opens after your attempt
A. (15)
Concept
The sum is ((a+4)+(a+12)+(a+20)=3a+36). From (3a+36=81), (a=15).
Why this answer is correct
The correct answer is A. (15). The sum is ((a+4)+(a+12)+(a+20)=3a+36). From (3a+36=81), (a=15).
Exam Tip
योग ((a+4)+(a+12)+(a+20)=3a+36) है। (3a+36=81) से (a=15) है।
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