Maths Arithmetic Progression Examples Level 3 Tutorial

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A)Product of 4th and 5th term of AP is 456. Division of 9th term by 4th term gives quotient as 11 and remainder as 10. Find 1st term.
B)The sum of 1st and 5th term of AP is 26 and product of second and 4th term is 160. Find sum of first 7 terms.

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A) (mn+1)/2 (B) 75