यदि (f(t)=a+6t) और (f(1), f(5), f(9)) का योग (180) है, तो (a) क्या है?
If (f(t)=a+6t) and the sum of (f(1), f(5), f(9)) is (180), what is (a)?
Explanation opens after your attempt
B. (30)
Concept
The sum is ((a+6)+(a+30)+(a+54)=3a+90). From (3a+90=180), (a=30).
Why this answer is correct
The correct answer is B. (30). The sum is ((a+6)+(a+30)+(a+54)=3a+90). From (3a+90=180), (a=30).
Exam Tip
योग ((a+6)+(a+30)+(a+54)=3a+90) है। (3a+90=180) से (a=30) है।
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