16th term of an arthmetic sequence is 84 added to the 4th . if the 24th term is 168 then.
what is the first term?
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Answer:
a=7
Step-by-step explanation:
According to questions
16th term = 84+ 4th term
a+15d= 84+ a+3d
a-a +15d-3d = 84
12d= 84
d= 84/12
d=7
Given: 24th term = 168
a+23d = 168
a+23*7 = 168
a+161=168
a=168-161
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