which term of the ap is1,4,7------ is 88?
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Here, a=1, tn=88, To find: n=?
Solution: The formula is
tn= a+(n-1)d
88 = 1+(n-1)3
88-1=3n-3
87+3=3n
90=3n
n=90÷3
therefore n is equal to 30
The 30th term is 88
Answer is 30
Solution: The formula is
tn= a+(n-1)d
88 = 1+(n-1)3
88-1=3n-3
87+3=3n
90=3n
n=90÷3
therefore n is equal to 30
The 30th term is 88
Answer is 30
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