### If the first term of an AP is a and nth term is b, then its common difference is

A. $\frac{ba}{n+1}$ B. $\frac{ba}{n-1}$ C. $\frac{ba}{n}$ D. $\frac{b+a} {n-1}$ Answer: Option B
Show Answer

### Solution(By Apex Team)

In the given AP First term = a and nth term = b \begin{aligned}&\therefore a+(n-1)d=b\\ &\Rightarrow(n-1)d=ba\\ &\Rightarrow d =\frac{ba}{n-1}\end{aligned}

A. 22
B. 25
C. 23
D. 24
Show Answer

A. 5
B. 6
C. 4
D. 3
Show Answer

A. -45
B. -55
C. -50
D. 0
Show Answer

A. 600
B. 765
C. 640
D. 680
Show Answer