Find the 28th term from the end of the ap
6,9,12,15,18,__________,102
Answers
Answered by
3
Answer:
a = 6 ( first term )
d = 3 ( common difference)
n = 28
formula used:
term = a + ( n - 1)d
term = 6 + 27 × 3
term = 87 (Ans)
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Answered by
2
Answer:
a=6
d=9-6=3
an=102
102=6+(n-1)3
102-6=3n-3
96+3=3n
99=3n
n=33
now 28th term from last
33-28+1=6th term
a6=6+(6-1)3
=6+5×3
=6+15
=21
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