Question

Find the common difference of an AP in which
aus a25 - a12= -52
​

Answer 1

a25 - a12 = -52

[a1 + (25-1)d] - [a1 + (12-1)d] = -52

[a1 + 24d] - [a1 + 11d] = -52

a1 + 24d - a1 - 11d = -52

then a1 and -a1 cancels

24d - 11d = -52

13d = -52

d = -52/13

d = -4

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Answer 2

Answer:

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