in an ap the first term is 8, and common difference is 7. if the last term of an ap is 218, find middle term
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Answer:
113
Step-by-step explanation:
a= 8
d= 7
last term or an = 218
an= a+(n-1)d
218= 8+ (n-1)7
218-8 = (n-1)7
210/7= n-1
30= n-1
30+1 = n
no. of terms = 31
now , middle term = n+1/2
31+1/2= 32/2 = 16
middle term will be 16th term
now ,
an = a+ (n-1)d
an= 8+ ( 16-1)7
an = 8 + (15) 7
an = 8 + 105
an = 113
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