Find the sum of the first 19 terms of the ap. Whose nth tem is 7-4n
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an= 7-4n
let n = 1
an = 7-4×1 = 3
now second term find n= 2
an= 7-4n = 7- 4×2= -1
now 19 terms are find in puttind the value of n= 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
let n = 1
an = 7-4×1 = 3
now second term find n= 2
an= 7-4n = 7- 4×2= -1
now 19 terms are find in puttind the value of n= 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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