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maya29
@maya29
August 2021
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which term of an ap 3,8,13,18,......is 78
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venkat4613
An=a+n-1×d
78=3+5n-5
80=5n
n=16
1 votes
Thanks 1
venkat4613
brainliest plz
venkat4613
mark me as the brainliest
Panzer786
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.
0 votes
Thanks 2
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Answers & Comments
78=3+5n-5
80=5n
n=16
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.