5) In an A.P., if a= 7, d= 3, an=28, then the value of n is.......
a) -8
b) 10
c) 8
d) 21
Answers
Answered by
1
Answer:
-8
Step-by-step explanation:
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Answered by
1
Answer:
8
Step-by-step explanation:
an=a+(n-1) x d
28 =7+(n-1) x 3
28-7=3n-3
21=3n-3
21+3=3n
24=3n
n=24/3
n=8
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