Question

If an A.P. is 3,5,7,9……. Find the 12^th term of the A.P.

(a) 12

(b) 21

(c) 22

(d) 25

I got this question by my college director while I was bunking the class.

The query is from Arithmetic Progression(A.P.) in division Sequences and Series of Mathematics – Class 11

Answer 1

Correct answer is (d) 25

To elaborate: From the given A.P., a=3 and d=5-3 =2.

We know, an= a + (n-1) d => a12 = a+11d = 3+11*2 = 3+22 = 25.