please solve this question no 20
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Given that,
a = 5
d = 1.75
an = 20.75
n = ?
an = a + (n − 1) d
20.75 = 5 + (n-1) 1.75
15.75 = (n-1) 1.75
(n-1) = 15.75/1.75 =1575/175
= 63/7 = 9
n − 1 = 9
n = 10
Hence, n is 10.
a = 5
d = 1.75
an = 20.75
n = ?
an = a + (n − 1) d
20.75 = 5 + (n-1) 1.75
15.75 = (n-1) 1.75
(n-1) = 15.75/1.75 =1575/175
= 63/7 = 9
n − 1 = 9
n = 10
Hence, n is 10.
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