Question

If d = – 5, n = 10, a_n = 68, then find the first term.

विकल्प

• 113

• 23

• – 113

• – 23

Answer 1

113

Explanation:

Given: d = – 5, n = 10, a_n = 68

Now, we know

a_n = a + (n – 1)d

68 = a + (10 – 1) (– 5)

68 = a + (9) ( – 5) = a – 45

a = 68 + 45

= 113