The (n- 1 ) th term of an AP us given by 7, 12, 17 , 22, ..... Is
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an = a + (n-1 ) ×d
n = ( n-1 ) ..a = 7 ..d = 5
..7+(n-1-1 )×5
= 7 + (n-2) ×5
= 7+ 5n -10
=. 5n-5..is answer
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