the common difference of the A.P whose nth terms is an=2n+1 is
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Answer:
a2 = 2(2) +1= 5
a3 = 2(3) + 1= 7
According to formula
a2= a + d ----------- 1 (Put value of a2)
a3= a + 2d --------- 2 (put value of a3)
On solving equation 1 and 2
7- 5 = (a + 2d) - (a+d)
2 = d
Therefore the common difference is 2
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