the 15th term of the 21,16,11,6,1,-4,-9....is
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Hola there,
A.P. = 21, 16, 11, 6, 1, -4, -9....
a = 21
d = 16 - 21 = -5
n = 15th
an = a + (n - 1)d
=> a15 = 21 + (15 - 1)(-5)
=> a15 = 21 + (14)(-5)
=> a15 = 21 - 70
=> a15 = -49. ...Ans
Hope this helps....:)
A.P. = 21, 16, 11, 6, 1, -4, -9....
a = 21
d = 16 - 21 = -5
n = 15th
an = a + (n - 1)d
=> a15 = 21 + (15 - 1)(-5)
=> a15 = 21 + (14)(-5)
=> a15 = 21 - 70
=> a15 = -49. ...Ans
Hope this helps....:)
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