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saindulakavath:
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Prizes are :
400
600
800
1000
400
600
800
1000
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5
Sn = Rs 2800
n = 4
common difference (d) = 200
so, Sn = n/2[2a+(n-1)d]
2800 = 4/2 [2a+ ( 4-1)200]
2800 = 2 [ 2a +3×(200)]
1400 = 2a +600
1400 -600 =2a
800 = 2a
800/2 =a
400 = a
so, a= 400rs
A.P. = 400 , 600, 800, 1000
HOPE IT HELPS U☆
n = 4
common difference (d) = 200
so, Sn = n/2[2a+(n-1)d]
2800 = 4/2 [2a+ ( 4-1)200]
2800 = 2 [ 2a +3×(200)]
1400 = 2a +600
1400 -600 =2a
800 = 2a
800/2 =a
400 = a
so, a= 400rs
A.P. = 400 , 600, 800, 1000
HOPE IT HELPS U☆
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