Question

if 4th and 10th term of an AP are 75 ans 117 respectively . Find the 1st term and common difference

Answer 1

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Answer 2

Answer:

4th term = a+3d = 75

10th term = a+9d = 117=>a+3d+6d=117

=>75+6d=117

=>6d=42

=>d=7

then, a=75-3(7)=75-21

a=54