Wednesday, 12 June 2013

SEQUENCE & SERIES - 2



The 1st term of arithmetic progression is 12 and the common difference is 30. Find the 7th term

solution

A1  = 12, d = 30, n = 7, A7 = ?

An = A1 + (n-1)d

A7  = A1 + (7-1)d

A7  = A1 + 6d

A7  = 12 + (6x30)

A7  = 12+180

A7  = 192

Hence the 7th term is 192



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