Question

Find $t_{11}$ from the given A.P. 4, 9, 14, ...

• A. 54
• B. 55
• C. 51
• D. 21

Answer 1

Answer: (A)

54

Given series is $4,9,14,....$

Clearly, the given sequence is an AP with first term $a=4$ and the common difference $d=5$.

We know, $a_n=a+(n-1)d$
Now, $t_{11}=a+10d$

$\therefore t_{11}=4+10\times 5=54$