which term of an ap 3,8,13,18,......is 78
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an=a+n-1×d
78=3+5n-5
80=5n
n=16
78=3+5n-5
80=5n
n=16
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Answered by
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AP=3,8,13,18,........
an=78
first term of the AP (a) =3
common difference (D)= a2-a1 =8-3=5
number of term (n)= ?
an=a+(n-1)×d
78=3+(n-1)×5
78=3+5n-5
5n=78+5-3
5n=83-3
5n=80
n=80/5
n=16
therefore,
16th term of the given AP is 78.
an=78
first term of the AP (a) =3
common difference (D)= a2-a1 =8-3=5
number of term (n)= ?
an=a+(n-1)×d
78=3+(n-1)×5
78=3+5n-5
5n=78+5-3
5n=83-3
5n=80
n=80/5
n=16
therefore,
16th term of the given AP is 78.
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