Question

find the 11th term from the last term of the AP 10,7,4,.......-62​

Answer 1

Step-by-step explanation:

Here, a = 10, d = 7 – 10 = – 3, l = – 62, where l = a + (n – 1) d To find the 11th term from the last term, we will find the total number of terms in the AP. So, – 62 = 10 + (n – 1)(–3) i.e., – 72 = (n – 1)(–3) i.e., n – 1 = 24 or n = 25 So, there are 25 terms in the given AP. The 11th term from the last term will be the 15th term. (Note that it will not be the 14th term. Why?) So, a15 = 10 + (15 – 1)(–3) = 10 – 42 = – 32 i.e., the 11th term from the last term is – 32.

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Answer 2

AP=-62,......4,7,10

a=-62

d=3

a11 = a+10d

=-62+10(3)

=-62+30

=-32

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