Monday 11 April 2016

ARITHMETIC PROGRESSION-1


The 1st term of an A.P. is 73 and the common difference is 16. Find the 10th term.

Solution

A1= 73, d = 20

An = A1 + (n-1)d

A10 = A1 + (10-1)d

A10 = A1 + 9d

A10 = 73 + (9x16) [ after substituting A1= 73, d = 16 as given above]

A10 = 73 + 144

A10 = 217

Hence the 10th term is 217.


TRY THIS……………


The 1st term of an A.P. is 76 and the common difference is 49. Find the 9th term.

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