Question

In an AP the sum of first
11 terms is 14 & the Sum of
- next 11 terms is 55.
Find the first of term of AP​

Answer 1

Step-by-step explanation:

Let the AP be a, a+d, a+2d, ...; ==> First term is a and common difference is d  

ii) Sum of first 11 terms is: (11/2)*(2a + 10d) = 44  

This simplifies to: a + 5d = 4 ------ (1)  

iii) Sum of next 11 terms = 55; so sum of first 22 terms is 44 + 55 = 99.  

==> (22/2)(2a + 21d) = 99  

==> 2a + 21d = 9 ------- (2)  

iv) Solving (1) & (2), we have a = 39/11 and d = 1/11  

hope it help u....

Answer 2

Answer:

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