The 8th term of an AP is 17 and 19th term is 30 find the common difference PLEASE DO WITH FORMULA
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a8=17, a19=30.
an=a+(n-1)d
17=a+(8-1)d
17=a+7d - eq. 1
an=a+(n-1)d
30=a+(19-1)d
30=a+18d - eq. 2
Subtract eq. 1 from eq. 2
30=a+18d - 17=a+7d
13=11d
d=13/11
Therefore, 17=a+7d
17=a+7*13/11
17=a+91/11
17*11=a+91
187=a+91
a=187-91
a=96
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