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Rd Chapter 9 Arithmetic Progressions Ex 9.5 Solutions

Question - 11 : - The angles of a triangle are in A.P. The greatest angle is twice the least. Find all the angles. [NCERT Exemplar]

Answer - 11 : - Given that, the angles of a triangle are in A.P.

Question - 12 : - The sum of four consecutive numbers in A.P. is 32 and the ratio of the product of the first and last terms to the product of two middle terms is 7 : 15. Find the number. [NCERT Exemplar]

Answer - 12 : -


or, d = ± 2
So, when a = 8, d = 2,
the numbers are 2, 6, 10, 14.

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