1.

30th term of the AP: 10, 7, 4, ……….. is (A) 97 (B) 77 (C) -77 (D) -87

Answer»

Answer is (C)

a = 10. d = 7 – 10 = -3, n = 30, a30 =? 

an = a + (n – 1)d 

a30 = 10 + (30 – 1)(-3) 

= 10 + 29(-3) 

= 10 – 87 

∴ a30 = -77



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