Question

30th term of the Ap : 10 ,7,4,........,is

A) 97 B) 77 C) -77 D) -87
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Answer 1

Answer:

30th term of AP is -77

Step-by-step explanation:

AP is given as 10, 7, 4....

Here first term, a = 10

Common difference, d = (7 - 10) = -3

nth term of AP is given as

Tn = a + (n - 1)d

T30 = 10 + (30 - 1)(-3)

T30 = 10 + 29(-3)

T30 = 10 - 87

T30 = -77

Answer 2

Given :-

AP = 10, 7, 4, ...... an

here,

• first term = a

= 10

• common difference = d

= 7 - 10

= -3

• n = 30

we know,

general formula to find nth term is a +  (n - 1)d

∴ the 30th term of the AP is = 10 + (30 - 1)-3

= 10 + (29 * -3)

= 10 + (-87)

= 10 - 87

= -77

hence, the correct option is c) -77