The 3rd term of an AP is 3 and the 11th term is -21, find its first te – InterviewSolution

1.	The 3rd term of an AP is 3 and the 11th term is -21, find its first term and common difference.
Answer» -STEP EXPLANATION:a+2d=3---(EQUATION 1)a+10d=-21---(equation 2)SUBTRACTING equation 1 from equation 2a-a+10d-2d=-21-38d=-24d=-3a=3-2(-3)a=3+6a=9first term is a=9common difference is d= -3

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