which term of the AP 3,8,13,18... is 78?
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Answered by
1
Step-by-step explanation:
a=3
d=8-3
=5
n=?
an=78
an= a+(n-1) d
78=3+(n-1) 5
78-3=(n-1) 5
75/5= (n-1)
15 = n-1
15+1=n
16=n (Ans)
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Answered by
0
Answer:
16th term will be 78.
Step-by-step explanation:
a= 3
d = 8-3
= 5
an = 78
now,
an = a + ( n-1 ) d
78 = 3 + ( n - 1 ) 5
78 - 3 = 5n - 5
75 = 5n - 5
75+5 = 5n
80 / 5 = n
16 = n
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