Question

which term of the A.P 7,12 17,22..will be 82
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Answer 1

Step-by-step explanation:

an = a+(n-1)d

a=7 , d= 5, an= 82

82=7+(n-1)5

75/5 = n-1

15= n-1

n= 16

therefore 16th term of this A.P. will be 82

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Answer 2

a = 7

d = 12-7=5

an= a+(n-1)d

82= 7+(n-1)×5

82-7=(n-1) ×5

75= (n-1)×5

75/5=n-1

15=n-1

15+1=n

16= n