Question

if a+1,2a+1,4a-1 are in AP.,then value of a is :???? the options are :(a)1 (b)2 (c)3 (d)4

Answer 1

the value of a is 2

Answer 2

$a = 2 \\ a + 1 = 2 + 1 = 3 \\ 2a + 1 = 2 \times 2 + 1 = 4 + 1 = 5 \\ 4a - 1 = 4 \times 2 - 1 = 8 - 1 = 7 \\ \:$