Answer :

Formula Used.


an = a + (n–1)d


If a = –100, d = 7


Then a1 = a + (n–1)d = –100 + (1–1)7 = –100


a2 = a + (n–1)d = –100 + (2–1)7 = –100 + 7×1 = –93


a3 = a + (n–1)d = –100 + (3–1)7 = –100 + 7×2 = –86


a4 = a + (n–1)d = –100 + (4–1)7 = –100 + 7×3 = –79


an = a + (n–1)d = –100 + (n–1)7 = 7n–107


The A.P is –100, –93, –86, –79……, 7n–107


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