Question

If a, a-5, 3a are in AP then a is equal to *
1 point following are the options:
-5
10
15
-2

Answer 1

in an AP common difference (d) = a2 - a1

where a2 is second term and a1 is first term

and d is also equal to a4 - a3 , a6 - a5 ,........

=> ( a - 5) - a = 3a - (a - 5)

=> -5 = 3a - a + 5

=> 2a = -10

=> a = -5

Hence option (1) is correct

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