Which term of the a. P 3,8,13,18......... is 78?
nishuuuu:
use the formula a+(n-1)d where a=3 ar d =5
so 3 +(n-1)×5=78
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a = 3
d = 5
an = 78
So, we need 'n'
Now,
an = a + (n -1)d
78 = 3 + (n - 1)5
(n-1)5 = 78 - 3
(n - 1) = 75/5
n - 1 = 15
n = 15 + 1
n = 16
Thus, 16th term of this A.P. will be 78.
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Hope it was helpful.
d = 5
an = 78
So, we need 'n'
Now,
an = a + (n -1)d
78 = 3 + (n - 1)5
(n-1)5 = 78 - 3
(n - 1) = 75/5
n - 1 = 15
n = 15 + 1
n = 16
Thus, 16th term of this A.P. will be 78.
●●●●●●●●●●●●●●●●●●
Hope it was helpful.
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