The 54th term of Arithmetic series is --61 and its 4th term is 64 find its 23rd terms
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Hi Mate!!!
Nth term in A.P is = a + ( n -1 ) d
Where a is ist term , n is no. of terms and d is common difference.
=>. T54th = a + 53d
=>. -61 = a + 53d .....1
And
=>. T4th = a + 3d
=>. 64 = a + 3d ......2
From 1 and 2
-125 = 50d
=>. d = -2.5
Now put value of d in 2
=>. a = 143 /2
T23rd term = a + 22d
T23rd = 143 / 2 + 22 ( -2.5)
=>. 16.5
Have a nice time....
Nth term in A.P is = a + ( n -1 ) d
Where a is ist term , n is no. of terms and d is common difference.
=>. T54th = a + 53d
=>. -61 = a + 53d .....1
And
=>. T4th = a + 3d
=>. 64 = a + 3d ......2
From 1 and 2
-125 = 50d
=>. d = -2.5
Now put value of d in 2
=>. a = 143 /2
T23rd term = a + 22d
T23rd = 143 / 2 + 22 ( -2.5)
=>. 16.5
Have a nice time....
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