Grade 78 grade maths
what is 15th term of A.P whose 1st term is 25 and 3rd term is 31
what is 15th term of A.P whose 1st term is 25 and 3rd term is 31
1 Answer
SHAIK AASIF AHAMED
Hello student,
Please find the answer to your question below
Given 1stterm=a=25.....(1) and 3rdterm=a+2d=31......(2)
Substituting 2 in 1 we get 25+2d=31 so 2d=6 which gives d=3
So 15thterm=a+14d=25+14(3)=25+42=67
Please find the answer to your question below
Given 1stterm=a=25.....(1) and 3rdterm=a+2d=31......(2)
Substituting 2 in 1 we get 25+2d=31 so 2d=6 which gives d=3
So 15thterm=a+14d=25+14(3)=25+42=67
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