Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) If `a_1, a_2, a_3`..... is an arithmetic progression with common difference 1 and `a_1 + a_2 + a_3 + ....+ a_98` = 137 the value of `a_2 + a_4 + a_6 +..... + a_98` is - Sarthaks eConnect

If `a_1, a_2, a_3`..... is an arithmetic progression with common difference 1 and `a_1 + a_2 + a_3 + ....+ a_98` = 137 the value of `a_2 + a_4 + a_6 +..... + a_98` is :

If `a_1, a_2, a_3`..... is an arithmetic progression with common difference 1 and `a_1 + a_2 + a_3 + ....+ a_98` = 137 the value of `a_2 + a_4 + a_6 +..... + a_98` is :

A.

95

B.

91

C.

93

D.

97

Solution

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Best answer

d=1 let `a_1=a`

`a_1+a_2+.............+a_98=137`

`98/2[2a+97]=137` .............(1)

49(2a+97)=137

`2a+97=137/49` .................(2)